Problem 1
We start at 8 on the number line. Then we move 7 units to the left to arrive at 1
So 8 + (-7) = 1
This is the same as saying 8 - 7 = 1.
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Problem 2
We start at -3. We'll move 5 units to the left to get to -8
So -3 + (-5) = -8
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Problem 3
Start at 7. Then move 7 units to the left to get to 0
7 + (-7) = 7 - 7 = 0
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Problem 4
Start at -2 and move 12 units to the right to get to 10 on the number line.
-2 + 12 = 10
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Problem 5
We start with -8 and move 10 spaces to the right to get to 2 on the number line.
-8 + 10 = 2