Find the sum using algebra tiles .
A.

1. +7 plus (+8)
2. - 5 plus (-2)
3. 3 plus (-9)
4. -8 plus (+6)
5. +13 plus (-6)

B.

Subtract using counters

1. -16 minus (-7)
2. +10 minus (-2)
3. +13 minus (+5)
4. +8 minus (-4)
5. - 9 - (+3)​