When subtracting signed numbers when you subtract a negative number you can just make the subtraction symbol an addition symbol and take away the negative sign

When adding signed numbers if you are adding a negative number you can just take a way the negative and make a positive number and subtract it instead of adding it

3 - (-9) = ?
or
3 + 9 = 12

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Tips

Subtracting signed numbers

Adding signed numbers

24 + (-5) = ?
or
24 - 5 = 19