There is only one rule that you have to remember when subtracting integers! Basically, you are going to change the subtraction problem to an addition problem.
"Keep - change - change"
What does that mean? Keep - Change - Change is a phrase that will help you "add the opposite" by changing the subtraction problem to an addition problem.
Keep the first number exactly the same. Change the subtraction sign to an addition sign. Change the sign of the last number to the opposite sign. If the number was positive change it to negative OR if it was negative, change it to positive.
Let's Practice Subtracting Integers
Ready to try some on your own? Don't forget to rewrite the problem first and then solve using your addition rules! Click here to check your answers.
1. 6 - (-7) = _______
2. -12 - 3 = _______
3. 10 - (-8) = _______
4. -9 - 10 = _______
5. -4 - (-12) = _______
6. -5 - 9 = _______
7. 2 - 12 = _______
8. -13 - (-10) = _______
How did you do? Are you ready for more of a challenge? Let's mix it up a little! Watch the signs!
9. 6 - (-7) + 8 = _______
10. 12 + (-15) - (-3) = _______
11. -8 - 4 - (-7) = _______
12. 3 - (-7) - 12 = _______
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