Chapter 1.4 Opposites, Integers & Absolute Value

Agenda Oct. 28

DO NOW

Homework Check

Substitution

Integers & Absolute Value - use frayer model vocabulary templates

Homework 25 PreAl p. 20 # 7 - 15, 22, 24, 26, 31 - 34, 40 - 46

Daily Scribe: Today Tomorrow Monday Tuesday

p. 32 # 32 - 44HW CHECK

32. -49 - 75 = -124

33. -65 - 15 = -80

34. 16 - (-3) = 19

35. 120 - (-50) = 170

36. 989 - 76 = 913

37. -35 - 25 = -60

38. -92 - (-9) = -83

39. -81 - (-13) = -68

40. 36 - 88 = -52

41. -90 - (-80) - 20 = -30

42. 810 - 30 - (-70)=850

43. 23 - (-15) - 28 = 10

44. -17 + 25 - (-58) = 66

Sort the expression in the light blue box into one of the three categories.

Variable Variable Expression Numerical Expression

82 + w

30/p 17 - 2 + 5

24 + 2 x 4

m 18s (5 + 9)/7

There are different ways to express multiplication and division.

Multiplication: Different ways to show four times y.4(y)4 • y4y (The number is always written before the variable.)(4)(y)4 x y (Try to avoid 4 x y because you may confuse the variable x and the times symbol x.)

Division: Different ways to show twelve divided by n.12/n12 ÷ n

VOCABULARYEvaluate – to evaluate a variable expression, you write the expression, substitute (replace) a number for each variable, and simplify.

EVALUATING EXPRESSIONS

What is the Area of this triangle?

A = 1/2bh Variable Expression

A = 1/2(4)(12) Substitute numbers for variables

12cm A = 24 cm2 Simplify

Example 1: Identify the variable. Evaluate the variable expression when y = 3.

A. 27y B. -12/y + 8

27y -12/y + 8

27(3) -12/3 + 8

-4 + 8

Click to revealanswer

Example 2: Find the area of a triangle if the base is 5 cm and the height is 4 cm. Remember to label!

A = (5)(4)

A = (20)

A = 10 cm2

drag the red check to the yellow check to reveal the answer

Frayer Model

Examples Nonexamples

Definition Characteristics

Frayer Model

opposite

numbers that are the same distance from zeroon a number line but inopposite directions

Frayer Model

integer

the whole numbers and their opposites

whole numbers are 0, 1, 2 ,...

Frayer Model

ExamplesNonexamples

absolute value

a number's distance from zero on the number line

Chapter 1.4 Opposites, Integers & Absolute Value

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