Integer Addition With Counters

In class we modeled integer addition problems with counters.

Yellow is Positive and Red is Negative

• 4 + (-3) = 1

• -4 + (-3) = -7

• -4 + 3 = -1

• 4 + 3 = 7

How many Zero Pairs are in the model?

• 6

• 4

• -2

• 2

What is the sum?

• -2

• -4

• 6

• 2

What expression is represented by the counters?

• -12 + 5 = 7

• -12 - 5 = 5

• -12 + 5 = -7

• -12 + 5 = -5

• A

• B

• C

• D

Evaluate -12 + 4 =

Mathematical Equivalence

ON

Which equation represents the 2-color counters shown in the image? Yellow is Positive and Red is Negative

• 4 + 1 = 5

• 4 + (-1) = 5

• 4 + (-1) = 3

• -4 + 1 = -3

Use the counters to find the sum of the integers. 

• 17

• -2

• -1

• -17

Which addition equation matches the problem modeled below? (Yellow is positive and Red is negative)

• -2 + -4 = -6

• 2 + -4 = -2

• 4 + 2 = 6

• 7
• 5
• -7
• -5