Adding and Subtracting Positive and Negative Numbers on a Number Line

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

Which equation is represented by the model below?

• -5 + 3 = -2

• 5 + (-3) = 2

• 5 + 3 = 8

• -5 + (-3) = -8

-7 - 2

• -9

• 9

• 5

• -5

3 + -7

• 10

• 4

• -10

• -4

-8+4

• 12

• -4

• 0

• 4

(-4) + 5

• 1

• 9

• -9

-6 + -4

• 2

• 10

• -2

• -10

7.6 - -6.5

• -11.8

• 1.1

• -16.3

• 14.1

3 - (-13)

• -10

• 10

• -16

• 16

14 - (-7) =

• 21

• -21

• -7

• 7