-5
Here is a quick tip, when the negative number is larger, pretend it is positive and subtract the smaller one from it. Then just put the negative sign back on
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negative 15 plus positive three = negative twelve -15 + +3 = -12
Negative 15 minus 5 can be solved by subtracting 5 from -15. This results in -20, as subtracting a positive number from a negative number increases the magnitude of the negative value. In mathematical terms, -15 - 5 = -20.
15 + 5 = 20
-3 + 15 = 12
55 + 34 + 31 + 27 + 21 + 21 + 20 + 17 + 15 + 15 = 256