Modeling Addition of Integers

Addition

5+8=

Addition

3+7=

• 9 + 4 = 13
• 9 + (-4) = 5
• -9 + 4 = -5
• -9 + (-4) = -13

What is the answer that the counters are modeling?

• 5

• 3

• 0

• -2

• 4 + 3 = 7
• 4 + (-3) = 1
• -4 + 3 = -1
• -4 + (-3) = -7

(+++)+(+++) = 

• Negative answer

• Positive answer 

Addition

5+7=

Addition

5+2=

Addition

4+7=

Addition

6+1=