• What two numbers will give you a product of 64 and a quotient of 4?

• 16 and 4

• 16 x 4 = 64

• 16 ÷ 4 = 4

Adding Integers• We can use positive and negative

counters to model the addition of integers.

Positive Integer Negative Integer

A positive integer paired with a negative integer form a zero pair. The value of a zero pair is 0.

Add -2 + (-4) = -6

Add 5 + 6 = 11

Add -3 + (-5) = -8

Add -3 + -2 = -5

Do you notice a pattern or rule?Comp book page 24

Adding Integers with like signs.

- add their absolute values, keep the same sign as the integers.

Examples:

-7 + (-3) = -10 5 + 4 = 9

Add -5 + 3

Remove all the zero pairs.

= -2

Add 4 + (-1) = 3

Remove all the zero pairs.

Add -6 + 5

Remove all the zero pairs.

= -1

Add 3 + (-7)

Remove all the zero pairs.

= -4

Did you notice a pattern or rule?Comp book page 24

Adding integers with unlike signs.

- When the signs are different, subtract their absolute values, keep the same sign as the integer with the greater absolute value.

Examples:

8 + (-3) = 5 -8 + 3 = -5

Let’s try a few examples using the rules for adding integers.

1) -8 + 8 =

2) -9 + -11 =

3) 13 + (-19) =

4) 7 + 5 =

5) -12 + 10 =

6) -22 + (-16) =

7) 18 + (-5) =

0

-20

-6

12

-2

-38

13

Adding Integers with like signs.

- add their absolute values, keep the same sign as the integers.

Adding integers with unlike signs.

- When the signs are different, subtract their absolute values, keep the same sign as the integer with the greater absolute value.