9-Aug-15Created by Mr. Lafferty Maths Dept. Add / Subtract Integers Double Negatives Integers Multiply +ve / -ve Integers Divide

19 Apr 202319 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.

Add / Subtract Integers

Double Negatives

IntegersIntegersw

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Multiply +ve / -ve Integers

Divide by +ve or -ve Integers


Starter QuestionsStarter Questionsw

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(a) 9.227 (b) 19.454 (c) 117.09

1. 25% of 25.2

3. 4.5% of 700p

4. Round to 1 decimal place

5. Find the value of x 4x +2 122

2. Calculate 30% of 80

19 Apr 202319 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww

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1.1. To remember rules for To remember rules for adding and subtract both adding and subtract both positive and negative positive and negative numbers.numbers.

1. We are learning how to add positive and negative numbers .

IntegersIntegersAddition & Subtraction

2. 2. To apply rules to simple To apply rules to simple questions.questions.


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1 + 3 = 1 + 3 =

-1 - 2 = -1 - 2 =

-3 + 5 =-3 + 5 =

4 - 5 = 4 - 5 =

44

-1-1

22

-3-3

4

3

2

1

0

-1

-2

-3

ThinkThermometer

Addition & Subtraction


Now try Exercise 3Ch2 (page 14)

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(a) 6.67 (b) 5.54 (c) 7.99

1. 99.6 + 7.27

3. 40% of 160p

4. Round to 1 decimal place

5. Find the value of x 5x +25 = 105



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1.1. To understand the ‘double To understand the ‘double negative’ rule for negative’ rule for numbers.numbers.

1. We are learning how to work with the ‘double negative’ for numbers.

IntegersIntegers

2.2. To simplify and solve To simplify and solve problems using theproblems using the‘double negative’ ‘double negative’

property.property.



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1 1 -- ( (-- 2) = 2) =

Double Negative

-1 -1 -- ( (- - 10) =10) =

-3 -3 -- ( (-- 5) = 5) =

- 4 - 4 –– ( (-- 5) = 5) =

33

11

22

99

1 1 ++ 2 = 2 =

- 4 - 4 ++ 5 = 5 =

- 3 - 3 + + 5 =5 =

-1 -1 ++ 10 = 10 =

Rule

- - = +

“Double negative make a positive”



Now try Exercise 4Ch2 (page 15)

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2 2 4


2. Calculate (-4) + (-5)

3. Calculate (a) 4 +3 (b) 2

4. The answer to the question is 90.

Write down as many diff erent questions as you can.


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1. We are learning how to multiply positive and negative numbers.

1. Understand how to multiply positive and negative numbers.

IntegersIntegersMultiplication


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IntegersIntegers

1 1 xx (-2) = (-2) =

Multiplying Integers

5 5 x x (-8) =(-8) =

(-3) (-3) xx 3 = 3 =

(-4) (-4) xx 5 = 5 =

(-2) (-2) xx (-1) = (-1) =

(- 2) (- 2) xx (-5) = (-5) =

(-5) (-5) x x (-5) =(-5) =

(-4) (-4) xx (-8) = (-8) =

Multiplication

-2-2

-20-20

-9-9

-40-40

22

1010

2525

3232

With your partner can try and come

up with the rules for multiplying integers

(+ve) x (+ve) = (+ve)

(-ve) x (–ve) = (+ve)

(-ve) x (+ve) = (-ve)(+ve) x (–ve) = (-

ve)

Same signs = positive answer

Different signs = negative answer


Now try MIA Ex 13.1

Ch1 (page 24)

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1.

Calculate 2.5

2. x + 5 = - 3 Find the value of x

3. Put in order, smallest first.

0.25, 0.19, 0.01, 0.026

5. Find the missing angle in the triangle.

% of 400

20o

xoxo


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1. We are learning how to divide by positive and negative numbers.

IntegersIntegers

1. Understand how to divide positive and negative numbers.

Division

1. Apply rules to simple number questions.


Now try MIA Ex 14.1

Ch1 (page 25)

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IntegersIntegersDivision

MNU 2-04aMNU 3-03bMNU 3-04a


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(-2) ÷ 1 =(-2) ÷ 1 =

(-25) ÷(-25) ÷ 55 = =

(-9) ÷ 3 =(-9) ÷ 3 =

20 ÷ (-5) =20 ÷ (-5) =

(-2) (-2) ÷÷ (-1) = (-1) =

(- 20) (- 20) ÷ ÷ (-(-5) =5) =

(-9) (-9) ÷ ÷ (-3) =(-3) =

(-40) (-40) ÷ ÷ (-8) =(-8) =

Division

-2-2

-4-4

-3-3

-5-5

22

44

33

55

With your partner can try and come

up with the rules for multiplying integers

(+ve) ÷ (+ve) = (+ve)

(-ve) ÷ (–ve) = (+ve)

(-ve) ÷ (+ve) = (-ve)

(+ve) ÷ (–ve) = (-ve)

Same signs = positive answer

Different signs = negative answer


Now try MIA Ex 14.1

Ch1 (page 25)

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IntegersIntegersDivision

Documents

9-Aug-15Created by Mr. Lafferty Maths Dept. Add / Subtract Integers Double Negatives Integers Multiply +ve / -ve Integers Divide