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To answer subtraction and addition problem questions, this is the steps:

Keep the sign of the first number
Flip the sign (If -, make it + and vice versa)
Change the sign of the second number (If negative, make it positive and vice versa)
Apply common sense on adding/subtracting those

-5 + 7 
Keep the first number
Flip the sign
-5 - 
Change the sign of the second number
-5 - -7
Apply common sense on subtracting/adding the number
-5 - -7 = +2 or 2

In multiplying, if the signs are alike, the answer is always positive, if the signs are unlike, the answer is always negative.

5 x 5 = 25
-5 x -5 = 25
-5 x 5 = -25
5 x -5 = -25


0 0 0
Same sign add & keep different sign subtract
copy the sign of the bigger number & that will be exact
0 0 0
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