Adding and Subtracting Integers
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- Put an equation on the board, but note that this time they will be subtracting. Subtraction can also be called take away or the opposite of.
- Set up this example: -8 – (-4) =
- You will have one pile of 8 red counters and another of 4 red counters. When you subtract, you will turn over the counter pile that is directly after the minus sign because subtract means to do the opposite. Therefore, you will now have 8 red counters and 4 yellow counters. You now have an addition problem and the answer is -4.
- When subtracting integers, you make two moves: one is to change the subtraction sign to addition and the other is to change the sign of the number directly following the subtraction sign.