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Why do you use subtraction when you add a positive integer and a negative integer?
Because adding a negative is the same as subtracting a positive. In other words, minus a plus is he same as plus a minus. For example 5+ (-3) = 5-3 = +2 5 -(+3) = 5-3 = +2 Remember minus a plus = = minus plus a minus = minus plus a plus = plus minus a minus = plus
What is negative 20 minus negative 5?
-20 -(-5) = -15 ie -(-5) = +5 therefore -20 +5 =15 (two double minuses = a positive)
What does negative 8 minus negative 13 equal?
-8 - (-13) = - 8 + 13 = +5 ( minus a minus is a plus)
13 plus negative 12 minus negative 5 equals?
6
Negative add to another negative is?
When you have a minus and a plus sign together, you simply ignore the plus sign. For example -5 + -3 is the same as -5 - 3 which is -8. If you have two minus signs together, you replace them with a plus sign. For example -5 - -3 is the same as -5 + 3 which gives -2. At school I learned a simple rule: 'Minus a minus is a plus'
