make it a '+ negative number'.
Example: 6 - 7 = -1
6 + (-7) = -1
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in a multiplication problem, you don't have to. in addition & subtraction, you do
Because a negative negative is the same a a positive, and because of the definition of subtraction and addition.
3-3=0
"How many ?" is counting. It can be the result of any math operation.In fact, "How many ?" is the question at the end of EVERY math problem. Whateverthe problem is, it always says "After you do this, how many do you wind up with ?"
addition and subtraction