Adding and Subtracting integers

Adding and Subtracting integers

By Habeeba Moosa

Addition sign rule

​(+) + (+) = + (add)

Example

a) 6 + 3 = 9 b) (+5) + 6 = 11

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​c) (-5) + (-6) = -11 d) -3 - 7 = -10​

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Same sign - add and put the same sign

​(-) + (-) = - (add)

Multiple Choice

Work out

7 + 3

• -10

• 10

• 21

• 4

Multiple Choice

Work out

- 8 - 3

• - 11

• 11

• - 5

• + 5

Multiple Choice

Work out

(+5) + (+11)

• - 16

• + 6

• + 55

• + 16

Addition sign rule

​(+) + (-) = Sign of the bigger number (Subtract)

Examples

a) 6 - 3 = 3 b) (-5) + 6 = 1

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c) 2 + (- 12)​ = - 10

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Different sign - subtract and write the sign of the bigger number

​(-) + (+) = Sign of the bigger number (Subtract)

Multiple Choice

Workout

(- 6) + (+6)

• - 12

• 12

• 0

• 6

Multiple Choice

Work out

7 - 11

• -4

• 4

• 18

• -18

Multiple Choice

+ 5 + (+ 3) + (- 3)

• 5

• - 1

• + 11

• - 11

Multiple Choice

12 - (-3) is same as

• 12 + 3

• 12 - 3

• - 12 - 3

• - 12 + 3

Multiple Choice

Work out

12 - (-3)

• - 15

• 15

• 9

• - 9

Multiple Choice

Work out

- 15 - (- 10)

• - 5

• 5

• - 35

• 35

Multiple Choice

Work out

6 - (+7) is same as

• 6 - 7

• 6 + 7

• - 6 - 7

• - 6 + 7

Poll

5 - 4 - 3

• - 2

• 2

• 12

• - 12

Open Ended

(- 5) + (+4) + (- 1)

Thank you!