Modeling Add and Subtracting Models

Challenge! Yellow is positive and red is negative. Which equation represents the model.

• -4 + (-2) = -6

• -4 + (-4) = -8

• -4 - (-2) = -2

• - 2 - (-4) = 2

The number line model represents which expression?

• -7 − 10

• -7 − 3

• -7 − (-10)

• 7 − (-3)

What is the answer that the counters are modeling?

• 5

• 3

• 0

• -2

Match the integer addition problem with the graph.

• -5 + (-2) = -7

• -5 - (-2) = -7

• -7 + (-2) = -5

• None of these. 

• 1 + 5 = 6
• -1 + 5 = 4
• 1 + (-5) = -4
• -1 + (-5) = -6

• -4 + 5
• 4 + 5
• 4 + (-5)
• -4 + (-5)

• 4 + 3 = 1
• 4 + (-3) = 1
• -4 + 3 = -1
• -4 + (-3) = -1

4 + 3 = 7

• 4 + 3 = 7

• 4 + (-3) = 1

• -4 + 3 = -1

• -4 + (-3) = -7

• -8 + (-5) = -13
• -8 + 5 = -3
• 8 + (-5) = 3
• 8 + 5 = 13

Which addition equation matches the problem modeled below?

• -6 + (-9) = 3

• -6 + 9 = 3

• -6 + 3 = 9

• 9 + (-3) = -6