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Think of adding negative numbers as starting with something positive, then gaining something you didn't want. You take 15 steps forward, and 3 steps back. It's just like subtracting 3 from 15.

15 + (-3) = 15 - 3 = 12.

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Wiki User

15y ago
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15 + 3 = 18

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Wiki User

14y ago
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15

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Wiki User

13y ago
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Q: What is 15 plus 3?
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