Cougar Time

Adding Negative Numbers

What are the two rules for adding integers?

Same Signs = Add and keep the sign

Different Signs = Find the absolute value, subtract and keep the sign of the larger absolute value

Subtracting Negative Numbers What is the rule for subtracting

integers?

Same Change Flip

Same – Keep the first number the same Change – Change subtraction to addition Flip – Flip the sign of the second number

Practice

-12 + 6 13 + (-8) (-16) + (-8)

-19 + 21 -78 + -15 18 + -4

-12 – (-15) 34 – 78 23 – (-17) 4 – 16 -27 – 11 -29 – (-8)

Multiplication and Division What are the rules multiplying and

dividing negative number?

Same Signs = Positive Different Signs = Negative

Practice

6 x (-8) -5 x 20 -8 x (-8) 9 x (-11) -14 x (-3)

32 ÷ -8 -120 ÷ -6 -88 ÷ -11 54 ÷ -6 -90 ÷ -15

Number Lines

Where on the number line are negative numbers? LEFT of zero!

Where on the number line are positive numbers? RIGHT of zero!

(-) Negative 0 (+) Positive

Mixed Review

Draw a number line ranging from -25 to 25

Write down the rules for adding and subtracting integers.

Write down the rules for multiplying and dividing integers.