B. Direction: Write a numerical expression for each model. Then find the sum. Let the white tile equals +1 and the black tile equals -1. Number 1 is done for you.
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Answer:
2. 5 + (-7) = (-2)
3. 3 + (-3) = 0
4. 3 + (-4) = (-1)
5. (-6) + 4 = (-2)
6. (-8) + 5 = (-3)