1. Order the following from least to greatest:

−5, 1, −2, −9 

Find the value of each expression.

2. 60.18 + 109.3

3. 7(5.7)

4. 14 ÷ 0.5

-9, -5, -2, 1

Zero Pair: ◦ A positive chip and a negative chip put together.

= 0

7

6

5

4

3

2

1

3

2

1

X

XX

X

XX

=

–1 + (– 4)

Using integer chips: Using a number line:

6 + (–3)

Using integer chips: Using a number line:

1. Determine the sign of the answers.• If both are positive, the sum is positive.• If both are negative, the sum is negative.• If there is one of each, the sum is the sign of the number

with the greatest absolute value.

2. Find the sum.• If integers have the same sign, add the absolute values and

use the sign determined above.• If integers have different signs, subtract the lesser absolute

value from the greater absolute value and use the sign determined above.

Find the value of –5 + (–2) + 1.

Find the sum of the first two numbers. –5 + –2 = –7

Add the third number to the sum. –7 + 1 = – 6

–5 + (–2) + 1 = –6

Find the value of each expression.

1. −5 + 2

2. 9 + (−8)

3. −2 + (−10)

4. −1 + (−4) + (−9)

5. 140 + (−122) + (−10)

Three methods for adding integers were introduced in this lesson (integer chips, number lines or integer rules). Which method do you prefer? Why?