Rules for subtracting signed numbers: |
We subtract signed numbers by changing the problem to addition. We
do this by changing the sign of the second number. Step 1: Change the sign of the second number to its opposite. Step 2: Change the operation to addition. Step 3: Follow the rules for adding signed numbers. |
Examples: +3 - -7 = step 1 change the sign of the 2nd number +3 - +7 = step 2 change the operation to addition +3 + +7 = step 3 follow addition rules (now they're the same sign) +3 + +7 = +10 -3 - -7 = step 1 change the sign of the 2nd number -3 - +7 = step 2 change the operation to addition -3 + +7 = step 3 follow addition rules (now they're the same sign) -3 + +7 = +4 |