Subtraction of Integers Using Counters and Number Lines

What can be added to these counters to make zero?

• One red counter

• Two yellow counters

• Two yellow counters and one red counter

• Two red counters

What about when we subtract a negative number?

-5 - (-4)

• -1

• 1

• 9

• -9

What is the answer to -2 - 8?

• -10

• 10

• 6

• -6

A subtraction sign means I will move ________on the number line.

• right

• left

What expression is represented by the counters?

• -12 + 5 = 7

• -12 - 5 = 5

• -12 + 5 = -7

• -12 + 5 = -5

Which expression is represented by the model?

• 6 - (-4)

• 6 - 4

• 6 - (-10)

• 6 - 10

• A

• B

• C

• D

(-2) - (-56) = 

• 54

• -54

• 58

• -58

Choose the integer operation problem(s) that this number line represents.

• -9 + (-7) = -2

• -9 + 2 = -7

• -9 + 7 = -2

• -9 - (-7) = -2

• None of these

(-87) - (-31) = 

• -56

• 56

• 111

• -111