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Chapter 1
Operations with Whole Numbers
1-1: Mathematical Expression
Variable
A variable is a symbol used to represent one or more numbers. The number that the variable represents is called the value of the variable. Examples:
b + 903 X n18 – my ÷ 24
Variable and Numerical Expressions
An expression such as b + 90
Is called a variable expression.
An expression such as 3 X 2
Is called a numerical expression.
Multiplication Symbols
We can used a raised dot as a multiplication symbol. 9 x 7 can be written as 9·72 x a x b can be written as 2·a·b
In a variable expression we can use the raised dot or omit the multiplication symbol.
3 x n can be written as 3·n3·n can be written as 3n 2 x a x b can be written as 2·a·b
2·a·b can be written as 2ab
EquationWhen a mathematical sentence uses an equal sign, it is called an equation. An equation tells us that two expressions name the same number. The expression to the left of the equal sign is the left side of the equation. The expression to the right of the equal sign is called the right side.
5 5 = 0
4 + 5 = 9
18 ÷ 9 = 2
2 · 4 = 8
An Equation is like a balance scale. Everything must be equal on both sides.
10 5 + 5=
An Equation is like a balance scale. Everything must be equal on both sides.
12 6 + 6=
An Equation is like a balance scale. Everything must be equal on both sides.
7 n + 2=
An Equation is like a balance scale. Everything must be equal on both sides.
7 n + 2=
5
Substitution
When a number is substituted for a variable in a variable expression and the operation is carried out, we say that the variable has been evaluated.
If n = 6, evaluate 3 · n If n = 6, 3 · 6 = 18
If x = 2, evaluate 3 + x If x = 2, 3 + 2 = 5
If y = 9, evaluate 18 ÷ y If y = 9, 18 ÷ 9 = 2
x = 10; y = 20. Evaluate
1. x 52. y x + 503. 50 x + y4. 50 + y x5. y 10 6. xy
10 5 = 5
20 10 + 50 = 60
50 10 + 20 = 60
50 + 20 10 = 60
20 10 = 10
10 · 20 = 200
1-2: Properties of Addition and Multiplication
The Set of Numbers
Counting numbers1, 2, 3, 4, 5, . . .
Whole numbers0, 1, 2, 3, 4, . . .
Commutative Property of Addition and Multiplication
The order in which two whole numbers are added or multiplied does not change their sum or their product.
3 + 4 = 7 and 4 + 3 = 7
3 x 4 = 12 and 4 x 3 = 12
a + b = b + a
a x b = b x a
Associative Property of Addition and Multiplication
Add6 + 5 + 7 =
1. (6 + 5) + 7 =2. 6 + (5 + 7) =3. (6 + 7) + 5 =
Multiply9 x 2 x 5 =
4. (9 x 2) x 5 =5. 9 x (2 x 5) =6. (9 x 5) x 2 =
1818
9090
18
90
Exercise
Simplify Using the Commutative and Associative Properties
1. 13 + 8 + 7
2. 5 x 7 x 2
Addition Property of Zero
• 7 + 0 = • a + 0 = • 8 + 0 = • c + 0 = • 2 + 0 =
7a8
c2
Multiplication Property of One
• 7 x 1 = • a x 1 = • 8 x 1 = • c x 1 = • 2 x 1 =
7a8c2
Multiplication Property of Zero
• 7 x 0 = • a x 0 = • 8 x 0 = • c x 0 = • 2 x 0 =
00000
1-4: The Distributive Property
The fee for each person entering the state park is $4. If the person rents a bicycle, he has to pay an additional $2. How much will a group of 12 people have to spend if each will enter the park and each will rent a bicycle?
12 · (4 + 2)
Two Methods:= 12 · 6 = 72
= (12 · 4) + (12 · 2) = 48 + 24 = 72
The fee for each person entering the state park is $4. If the person has a coupon, he gets a $2 discount. How much will a group of 12 people have to spend if each will enter the park with a coupon?
12 · (4 2)
Two Methods:= 12 · 2 = 24
= (12 · 4) (12 · 2) = 48 24 = 24
Simplify using the distributive property.1. (11 · 4) + (11 · 6)
=11 · (4 + 6) = 11 · 10 = 110
2. 13 · 15= (13 · 10) + (13 · 5) = 130 + 65 = 195
Simplify using the distributive property.1. 6 ( 20 + 4) 2. 4 ( 80 – 6)3. (4 x 12) + (4 x 8)4. (33 x 90) + (33 x 10)5. (23 x 104) – (23 x 4)6. (56 x 11) – (6 x 11)7. 35 (10 + 2)8. 33 ( 100 – 3)9. 12 x 2210. 32 x 811. 9 x 12012. 7 x 896
144304
80
3300
2300
550
420
3201
264
256
1080
6272
Test: 1-1, 1-2, 1-3, 1-4
1-5: Order of Operations
Grouping Symbols: Show which operations need to be performed first.
[ ]( )
When one pair of grouping symbols is enclosed in another, we ALWAYS perform the operation enclosed in the INNER pair of symbols FIRST.
(14 + 77) ÷ 7
[3 + (4 · 5)] · 10
Simplify(14 + 77) ÷ 7
91 ÷ 7
13
Simplify[3 + (4 · 5)] · 10
20 ] · 10
23
[3 +
· 10
230
For expressions that are written without grouping symbols like,
8 + 3 – 9 x 2 ÷ 3
Rule1. Do all multiplication and divisions in order
from left to right.2. Then do all additions and subtractions in
order from left to right.
Simplify72 – 24 ÷ 3
8 72 –
64
Rule1. Do all multiplication and divisions in order
from left to right.2. Then do all additions and subtractions in
order from left to right.
Simplify8 + 3 – 9 x 2 ÷ 3
18 8 + 3 –
–
Rule1. Do all multiplication and divisions in order
from left to right.2. Then do all additions and subtractions in
order from left to right.
÷ 3
6
5
11
Solve1. 12 ( 18 + 36)2. (100 – 16) ÷ 73. 4[(6 + 17)2]
1-6: A Problem Solving Model
Plan for Solving Word Problems1. Read the problem carefully. Make sure you understand what it says.
You may need to read it more than once.2. Use questions like these in planning the solution:
a. What is asked for?b. What facts are given?c. Are enough facts given? If not, what else is needed? d. Are unnecessary facts given? If so, what are they? e. Will a sketch or diagram help?
3. Determine which operations or operations can be used to solve the problem.
4. Carry out the operations carefully.5. Check your results with the facts given in the problem. Give the
answer.
The Golden Gate Bridge has a span of 4200 feet. The Brooklyn Bridge has a span of 1595 feet. How much longer is the span of the Golden Gate Bridge?
a. What number or numbers does the problem ask for?b. Are enough facts given? If not, what else is needed?c. Are unnecessary facts given? If so, what are they?d. What operation or operations would you use to find the
answer?
How many 30-second ads can a politician buy with $528,000?
a. What number or numbers does the problem ask for?b. Are enough facts given? If not, what else is needed?c. Are unnecessary facts given? If so, what are they?d. What operation or operations would you use to find the
answer?
Paula washed 5 cars and Jim washed 4. Paula charged $3 for each car. Jim charged $4. How much money did Paula earn?
a. What number or numbers does the problem ask for?b. Are enough facts given? If not, what else is needed?c. Are unnecessary facts given? If so, what are they?d. What operation or operations would you use to find the
answer?
Mike can type a page in 7 min. How many pages can he type in 45 min?
a. What number or numbers does the problem ask for?b. Are enough facts given? If not, what else is needed?c. Are unnecessary facts given? If so, what are they?d. What operation or operations would you use to find the
answer?
1-7: Problem Solving Applications
During the four quarters of a basketball game, the Hoopsters scored 16 points, 21 points, 19 points, and 17 points. How many points did the Hoopsters score during the game?
a. What number or numbers does the problem ask for?b. Are enough facts given? If not, what else is needed?c. Are unnecessary facts given? If so, what are they?d. What operation or operations would you use to find the
answer?
Simon had $165 in his checking account. He wrote checks for $32, $19, and $47. How much did Simon have left in his account?
a. What number or numbers does the problem ask for?b. Are enough facts given? If not, what else is needed?c. Are unnecessary facts given? If so, what are they?d. What operation or operations would you use to find the
answer?
The temperature was 15°C at 8am. By noon, the temperature had increased by 13°. What was the temperature at noon?
a. What number or numbers does the problem ask for?b. Are enough facts given? If not, what else is needed?c. Are unnecessary facts given? If so, what are they?d. What operation or operations would you use to find the
answer?
Test: 1-5, 1-6, 1-7Next: Chapter 11
Chapter 11
Operations with Integers
11-1: Negative Numbers
Objective: To represent negative numbers on the number line.
HW: P. 368: 1-39 ODD; 40-43 ALL; Read 11-2
The Number Line
Natural Numbers = {1, 2, 3, …}Whole Numbers = {0, 1, 2, …}Integers = {…, -2, -1, 0, 1, 2, …}
-5 0 5
Definition
Positive number – a number greater than zero.
0 1 2 3 4 5 6
DefinitionNegative number – a number less than zero.
0 1 2 3 4 5 6-1-2-3-4-5-6
Put the appropriate sign: > OR < OR =1. – 6 ____ 9
2. 2 ____ – 1
3. 12 ____ – 9
4. – 12 ___ 9
Use a number line and arrow to represent each integer.1. 3, starting at 0
2. – 3, starting at 0
3. 3, starting at – 1
4. – 3 starting at 2
Negative Numbers Are Used to Measure Temperature
0102030
-10-20-30-40-50
Negative Numbers Are Used to Measure Under Sea Level
Negative Numbers Are Used to Show Debt
Let’s say your parents bought a car but had to get a loan from the bank for $5,000. When counting all their money they add in –$5,000 to show they still owe the bank.
TemperatureSea Level
$Slope of a Line
FootballDirections on a #
Line
Cold
Example +─
-5 -4 -3 -2 -1 0 1 2 3 4 5
BelowDebt
DownhillYards Lost
Left
HotAboveProfitUphill
Yards GainedRight
DefinitionOpposite Numbers – numbers that are the same distance from zero in the opposite direction
0 1 2 3 4 5 6-1-2-3-4-5-6
Hint
If you don’t see a negative or positive sign in front of a number it is positive.
9+
Absolute Value: Absolute value is the distance from zero.
• The absolute value of 2 is 2 because 2 is 2 units away from 0.
• The absolute value of – 2 is 2 because – 2 is 2 units away from 0.
0 2-2
Absolute value is ALWAYS a POSITIVE number.
Absolute Value
Bars are used to show absolute value.
l -2 l = 2
l 2 l = 2
11-2: Adding Integers
Objective: To add positive and negative integers.
HWP. 373: 9 – 34 ALL (Tonight)
P. 374: 1-7 ALL; Read 11-3 (Tomorrow Night)
The Number Line
Natural Numbers = {1, 2, 3, …}Whole Numbers = {0, 1, 2, …}Integers = {…, -2, -1, 0, 1, 2, …}
-5 0 5
One Way to Add Integers Is With a Number Line
0 1 2 3 4 5 6-1-2-3-4-5-6
When the number is positive, countto the right.
When the number is negative, countto the left.
+–
One Way to Add Integers Is With a Number Line
6 7 8 9 101112543210
+
+6 + (+ 4) = + 10
+
The sum of two positive integers is a positive integer.
One Way to Add Integers Is With a Number Line
-6 -5 -4 -3 -2 -1 0-7-8-9-10-11-12
–– 6 + (– 4) = – 10
–
The sum of two negative integers is a negative integer.
0 1 2 3 4 5 6-1-2-3-4-5-6
+
–
+6 + (– 4) = +2
The sum of a positive and a negative integer is:1. Positive if the positive number has the greater
absolute value.2. Negative if the negative number has that greater
absolute value.3. Zero if both number have the same absolute value.
0 1 2 3 4 5 6-1-2-3-4-5-6
+
–
+3 + (–5) = –2
The sum of a positive and a negative integer is:1. Positive if the positive number has the greater
absolute value.2. Negative if the negative number has that greater
absolute value.3. Zero if both number have the same absolute value.
0 1 2 3 4 5 6-1-2-3-4-5-6+
–
+6 + (– 6) = 0
The sum of a positive and a negative integer is:1. Positive if the positive number has the greater
absolute value.2. Negative if the negative number has that greater
absolute value.3. Zero if both number have the same absolute value.
SHORT CUTAdding integers with the same sign
Positive + Positive: Add and make the sign
6 + 4 = 10
6 7 8 9 101112543210
+
+
positive.
SHORT CUTAdding integers with the same sign
Negative + Negative: Add and make the sign
– 6 + (– 4) = – 10negative.
-6 -5 -4 -3 -2 -1 0-7-8-9-10-11-12
–
–
Adding Integers with the Same Sign
1. -7 + -9 =2. 4 + 7 =3. -6 + -7 = 4. 5 + 9 =5. -9 + -9 =
-16
-18 14
-1311
SHORT CUTAdding integers with the different signs
Subtract and take the sign of the absolute value.
6 + (– 4 ) = 2
LARGER
0 1 2 3 4 5 6-1-2-3-4-5-6
+
–
SHORT CUTAdding integers with the different signs
Subtract and take the sign of the absolute value.
3 + (– 7 ) = – 4
LARGER
0 1 2 3 4 5 6-1-2-3-4-5-6+
–
SHORT CUTAdding integers with the different signs
Subtract and take the sign of the absolute value.
3 + (– 5 ) = – 2
LARGER
0 1 2 3 4 5 6-1-2-3-4-5-6
+
–
1) – 4 + 5
4) 7 + (– 1)
3) – 33 + 7
6) 2 + (–15) + (– 2)
2) 12 + – 15
5) – 8 + 3
1 – 3 – 26
6 – 5 – 15
Adding Integers with Different Signs
Adding Integers with Different Signs
1. -7 + 9 =2. 4 + (-7) =3. (-3) + (+4) =4. 6 + -7 = 5. 5 + -9 =6. -9 + 9 =
2
0
- 4
-11
- 3
Additive Inverse
The sum of any number and its additive inverse is
3 + (– 3 ) = 0zero.
0 1 2 3 4 5 6-1-2-3-4-5-6
+
–
11-3: Subtracting Integers
Objective: To subtract positive and negative integers.
HW: P. 376: 1-21 ODD; 23 – 30 ALL; Read 11-4
Subtracting Integers 3 5
When you subtract 5, it is like adding its opposite, 5.
3 + ( 5 ) =
0 1 2 3 4 5 6-1-2-3-4-5-6
+
–
2
1 ( 4 )When you subtract 4, it is like adding its opposite, 4.
1 + 4 =
Subtracting Integers
0 1 2 3 4 5 6-1-2-3-4-5-6
–
+
3
Subtracting IntegersKeep, Change, Change1.Keep the first number2.Change subtraction sign to addition3.Change the second number’s sign to its opposite.4.Follow the addition rules.
9+ (– 9) – 54 – 4 ==
(– 10)+ 10 177 – 7 ==
Subtract Positive Integers
Find 2 – 15.
2 – 15 = 2 + (–15)= –13
Keep, Change, Change1.Keep the first number2.Change subtraction sign to addition3.Change the second number’s sign to its opposite.4.Follow the addition rules.
A. AB. BC. CD. D
A. –34
B. –8
C. 8
D. 34
Find 13 – 21.
Subtract Positive Integers
Find –13 – 8.
–13 – 8 = –13 + (–8)= –21
Keep, Change, Change1.Keep the first number2.Change subtraction sign to addition3.Change the second number’s sign to its opposite.4.Follow the addition rules.
1. A2. B3. C4. D
A. –20
B. –2
C. 2
D. 20
Find –9 – 11.
Find 12 – (–6).
12 – (–6) = 12 + 6= 18
Keep, Change, Change1.Keep the first number2.Change subtraction sign to addition3.Change the second number’s sign to its opposite.4.Follow the addition rules.
1. A2. B3. C4. D
A. –13
B. –5
C. 5
D. 13
Find 9 – (–4).
Find –21 – (–8).
Subtract Negative Integers
–21 – (–8) = –21 + 8= –13
Keep, Change, Change1.Keep the first number2.Change subtraction sign to addition3.Change the second number’s sign to its opposite.4.Follow the addition rules.
A. AB. BC. CD. D
A. –23
B. –11
C. 11
D. 23
Find 17 – (–6).
ALGEBRA Evaluate g – h if g = –2 and h = –7.
Evaluate an Expression
g – h = –2 – (–7) Replace g with –2 and h with –7.
= –2 + 7 To subtract –7, add 7.
= 5 Simplify.
A. AB. BC. CD. D
A. –10
B. –2
C. 2
D. 10
ALGEBRA Evaluate m – n if m = –6 and n = 4.
Use Integers to Solve a Problem
GEOGRAPHY In Mongolia, the temperature can fall to –45ºC in January. The temperature in July may reach 40ºC. What is the difference between these two temperatures?
To find the difference in temperatures, subtract the lower temperature from the higher temperature.
Answer: The difference between the temperatures is 85ºC.
40 – (–45) = 40 + 45 To subtract –45, add 45.
= 85 Simplify.
A. AB. BC. CD. D
A. –26
B. –4
C. 4
D. 26
TEMPERATURE On a particular day in Anchorage, Alaska, the high temperature was 15ºF and the low temperature was –11ºF. What is the difference between these two temperatures for that day?
1) 8 – 13
4) – 25 – 5
3) 4 – (–19)
6) 54 – 14
2) 14 – 7
5) 13 – 7
– 5 23
– 30 6 40
7
Subtract Integers
Adding integersPositive + Positive: Add and make the sign positive.
6 + 4 = 10
Negative + Negative: Add and make the sign negative. – 6 + (– 4) = – 10 Positive + Negative: Subtract and take the sign of the LARGER absolute value. 6 + (– 4 ) = 2
Negative + Positive: Subtract and take the sign of the LARGER absolute value. – 3 + 2 = – 1
Subtracting IntegersKeep, Change, Change1.Keep the first number2.Change subtraction sign to addition3.Change the second number’s sign to its opposite.4.Follow the addition rules.
9+ (– 9) – 54 – 4 ==
(– 10)+ 10 177 – 7 ==
1) 16 – 14
4) – 12 + 16
7) – 19 – 1
10) 3 – 13
3) 99 + 11
6) – 23 + 15
9) – 447 – 23
12) 39 – 42
2) 9 + 26
5) – 22 + 18
8) – 14 – 16
11) 23 – 8
2 35 110
4 – 4 – 8
– 20 – 30 – 470
– 10 – 15 – 3
Subtract and Add Integers
1) 23 + 4
4) – 18 + 12
7) – 18 – (–12)
10) 18 + (– 12) + 5
3) 9 – (– 2)
6) 24 + (– 17)
9) – 15 – 0
12) – 14 + 0 + 13
2) – 4 – 2
5) – 24 + (–11)
8) 52 – (–30)
11) – 2 (–10) + 15
27 – 6 11
– 6 – 35 7
– 6 82 – 15
11 – 17 – 1
Subtract and Add Integers
1) a + ( – 12)
4) b + c
7) x – 7
10) x – (– z)
3) c + 23
6) a + b
9) y - x
12) x – z – y
2) – 20 + b
5) a + c
8) x - z
11) | y – z |
0 – 35 13
– 25 2 – 3
– 15 3 15
– 19 18 – 4
a = 12, b = – 15, c = – 10
x = –8, y = 7, z = – 11
Test: 11-1, 11-2, 11-3
11-4: Products with one negative number.
ObjectiveTo multiply a positive number and a negative number.
HWP. 379: 1-25 ODD; 26-33 ALL; Read 11-5
Multiplying Integers
• Same sign always has a positive answer.
• Different sign always has a negative answer.
• When multiplying by zero, you get zero, no matter what the sign is.
9 ● 3 = 27– 9 ● (– 3) = 27
9 ● (– 3) = – 27– 9 ● 3 = – 27
9 ● 0 = 0– 9 ● 0 = 0
Lesson 6 Ex1Multiply Integers with Different Signs
Find 5(–4).
Answer: –20
5(–4) = –20 The integers have different signs. This product is negative.
A. AB. BC. CD. D
A. –15
B. –2
C. 2
D. 15
Find 3(–5).
Lesson 6 Ex2Multiply Integers with Different Signs
Find –3(9).
Answer: –27
–3(9) = –27 The integers have different signs. This product is negative.
1. A2. B3. C4. D
A. –35
B. 2
C. 12
D. 35
Find –5(7).
Lesson 6 Ex3Multiply Integers with the Same Sign
Find –6(–8).
Answer: 48
–6(–8) = 48 The integers have the same sign. This product is
positive.
1. A2. B3. C4. D
A. –28
B. –11
C. 11
D. 28
Find –4(–7).
Lesson 6 Ex4Find (–8)2.
Answer: 64
Multiply Integers with the Same Sign
(–8)2 = (–8)(–8) There are two factors of –8.
= 64 The product is positive.
A. AB. BC. CD. D
A. –25
B. –10
C. 10
D. 25
Find (–5)2.
Lesson 6 Ex5Find –2(–5)(–6).
Answer: –60
Multiply Integers with the Same Sign
–2(–5)(–6) = [–2(–5)](–6)Associative Property
= 10(–6)–2(–5) = 10= –60The product is
negative.
A. AB. BC. CD. D
A. 84
B. –14
C. 14
D. –84
Find –7(–3)(–4).
• Explain what Product means.
1) 8 (–12)
4) –6 (–6)
3) –6 (–5)
6) –9 (1)(–5)
2) 25 (–2)
5) –4 (–2)(–8)
– 96 – 50 30
36 – 64 45
Multiply Integers
Lesson 6 Ex6Use Integers to Solve a Problem
MINES A mine elevator descends at a rate of 300 feet per minute. How far below the earth’s surface will the elevator be after 5 minutes?
If the elevator descends 300 feet per minute, then after 5 minutes, the elevator will be 300(5) or 1,500 feet below the surface. Thus, the elevator will descend to 1,500 feet below the earth’s surface.
Answer: After five minutes, the elevator will be 1,500 feet below the earth’s surface.
A. AB. BC. CD. D
A. –$468
B. $468
C. –$84
D. $84
RETIREMENT Mr. Rodriguez has $78 deducted from his pay every month and placed in a savings account for his retirement. What integer represents a change in his savings account for these deductions after six months?
Lesson 6 Ex7ALGEBRA Evaluate abc if a = –3, b = 5, and c = –8.
Answer: 120
Evaluate Expressions
abc = (–3)(5)(–8) Replace a with –3, b with 5, and c with –8.
= (–15)(–8) Multiply –3 and 5.
= 120 Multiply –15 and –8.
A. AB. BC. CD. D
A. –48
B. –4
C. 0
D. 48
ALGEBRA Evaluate xyz if x = –6, y = –2, and z = 4.
End of Lesson 6
Lesson 7 MenuFive-Minute Check (over Lesson 2-6)
Main Idea
California Standards
Example 1: Look For a Pattern
Lesson 7 MI/Vocab• Solve problems by looking for a pattern.
Look For a Pattern
HAIR Lelani wants to grow an 11-inch ponytail to cut off and donate to a program that makes wigs for children with cancer. She has a 3-inch ponytail now, and her hair grows about one inch every two months. How long will it take for her ponytail to reach 11 inches?
Explore You know the length of Lelani’s ponytail now. You know how long Lelani wants her ponytail to grow and you know how fast her hair grows. You need to know how long it will take for her ponytail to reach 11 inches.Plan Look for a pattern. Then extend the pattern to find the solution.
Lesson 7 Ex1Look For a Pattern
Solve After the first two months, Lelani’s ponytail will be 3 inches + 1 inch, or 4 inches. Her hair grows according to the pattern below.
3 in. 4 in. 5 in. 6 in. 7 in. 8 in. 9 in. 10 in. 11 in.
Answer: 16 months
+1 +1 +1 +1 +1 +1 +1 +1
It will take eight sets of two months, or 16 months total, for Lelani’s ponytail to reach 11 inches.Check Lelani’s ponytail grew from 3 inches to 11 inches, a difference of eight inches, in 16 months. Since one inch of growth requires two months and 8 × 2 = 16, the answer is correct.
A. AB. BC. CD. D
A. 3.5 mi
B. 15 mi
C. 16.5 mi
D. 19.5 mi
RUNNING Samuel ran 2 miles on his first day of training to run a marathon. On the third day, Samuel increased the length of his run by 1.5 miles. If this pattern continues for every other day, how many miles will Samuel run on the 27th day?
Lesson 8 MI/Vocab• Divide integers.
Dividing Integers
• Same sign always has a positive answer.
• Different sign always has a negative answer.
• When you divide 0 by number, no matter what the sign is, you get 0.
27 ÷ 3 = 9– 27 ÷ (– 3) = 9
27 ÷ (– 3) = – 9– 27 ÷ 3 = – 9
0 ÷ 3 = 0 0 ÷ (–3) = 0
Lesson 8 Ex1Dividing Integers with Different Signs
Find 51 ÷ (–3).
Answer: –17
51 ÷ (–3) = –17
A. AB. BC. CD. D
A. –4
B. 4
C. 27
D. 45
Find 36 ÷ (–9).
Lesson 8 Ex2Dividing Integers with Different Signs
Answer: –11
The integers have different signs. The quotient is
negative.
Find
1. A2. B3. C4. D
0%0%0%0%
A B C D
A. –5
B. 5
C. 36
D. 54
Lesson 8 KC 2
Lesson 8 Ex3Dividing Integers with Same Sign
Find –12 ÷ (–2).
Answer: 6
–12 ÷ (–2) = 6 The integers have the same sign. The quotient is
positive.
1. A2. B3. C4. D
0%0%0%0%
A B C D
A. –32
B. –16
C. –3
D. 3
Find –24 ÷ (–8).
• Explain what quotient means.
Lesson 8 Ex4ALGEBRA Evaluate –18 ÷ x if x = –2.
Answer: 9
Dividing Integers with Same Sign
–18 ÷ x = –18 ÷ (–2) Replace x with –2. = 9 Divide. The quotient is
positive.
A. AB. BC. CD. D
A B C D
0% 0%0%0%
A. –63
B. 63
C. 7
D. –7
ALGEBRA Evaluate g ÷ h if g = –21 and h = –3.
7) 50 ÷ – 5
10) – 26 13
9) – 21 – 7
12) 36 ÷ 4
8) – 100 ÷ (– 10)
11) 84 –12
– 103
– 2 – 7 9
10
Divide Integers
Lesson 8 Ex5
Answer: The car’s acceleration is –4 feet per second squared.
Subtract 80 from 40.
= –4 Divide.
PHYSICS You can find an object’s acceleration with the expression ,
where Sf = final speed, Ss = starting speed, and t = time. If a car was traveling at
80 feet per second and, after 10 seconds, is traveling at 40 feet per second,
what was its acceleration?
A. AB. BC. CD. D
A B C D
0% 0%0%0%
A. –20ºF
B. –4ºF
C. 12ºF
D. 4ºF
WEATHER The temperature at 4:00 P.M. was 52ºF. By 8:00 P.M., the temperature had gone down to 36ºF. What is the average change in temperature per hour?
Lesson 3 Ex1Naming Points Using Ordered Pairs
Write the ordered pair that names point R. Then state the quadrant in which the point is located.
Answer: R is (–2, 4). R is in Quadrant II.
A. AB. BC. CD. D
A. (–3, –1); Quadrant III
B. (2, 1); Quadrant I
C. (3, 1); Quadrant I
D. (3, –1); Quadrant IV
Write the ordered pair that names point M. Then name the quadrant in which the point is located.
1. A2. B3. C4. D
Graph and label the point G(–2, –4).
A. B.
C. D.
G
G
G
G
Lesson 3 Ex3GEOGRAPHY Use the map of Utah shown below. In which quadrant is Vernal located.
Answer: Quadrant I
Locate an Ordered Pair
1. A2. B3. C4. D
A. Quadrant I
B. Quadrant II
C. Quadrant III
D. Quadrant IV
GEOGRAPHY Use the map of Utah. In which quadrant is Tremonton located.
Lesson 3 Ex4Which of the cities labeled on the map is located in Quadrant IV?
Answer: Bluff
Identify Quadrants
A. AB. BC. CD. D
A. Tremonton
B. Vernal
C. Bluff
D. Cedar City
Name a city from the map of Utah that is located in Quadrant III.
Dave goes to the video store to rent a movie. The cost per movie is $3.50. Make a table that shows the amount Dave would pay for renting 1, 2, 3, and 4 movies.
Melanie read 14 pages of a detective novel each hour. Write an equation using two variables to show how many pages p she read in h hours.
Let p represent the number of pages readLet h represent the number of hours.
Equation p = 14 ● h
Equation p = 14 h
On an average day, Nancy can pick 2 rows of strawberries per hour. The table shows the number of rows she can pick in a given number of hours. Complete the table.
Number of hours worked Number of rows picked
1 2
2 4
3 ?
4 ?
5 ?
Let t stand for the number of hours worked. Write an expression for the number of rows picked.
Let r stand for the number of rows picked. Write an expression for the number of hours worked.
6
8
10
2t
r ÷ 2