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20 questions
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
7 - (-11) + 3
-1
-7
15
21
What number line models 6 - 9?
What problem is shown with this number line?
3 - 2
2 - 3
3 - (-2)
5 - 2
Which addition equation matches the problem modeled below? (Yellow is positive and Red is negative)
-2 + -4 = -6
2 + -4 = -2
4 + 2 = 6
Which equation represents the 2-color counters shown in the image? (Yellow is Positive and Red is Negative)
-4 + 5 = -1
4 + 5 = 9
4 + (-5)= -1
-5 - 4 = -9
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