plus times plus = plus
minus times plus = minus
plus times minus = minus
minus times minus = plus
so when you subtract a number it is the same as adding its negative; for example
7 - 4 = 3
7 + (1)(-4) = 3
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Subtracting a negative integer is the same as adding its absolute value.
adding its opposite?
Subtracting a negative is like adding a positive.
by adding, subtracting, dividing, and multiplying.
The opposite of 243 is -243.