4-1 Adding and Subtracting with like Denominators
A. Rules for Adding Positive and Negative Numbers. To add two positive numbers, add and keep the positive sign. Example: (+6) + (+7) = +13. ... B. Rules for Subtracting Positive and Negative Numbers. To subtract signed numbers (either positive or negative), change the subtraction sign to addition and change the sign of the number that follows ... ................
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