12. 1) If the problem is addition, follow your addition rule. 2) If the problem is subtraction, change subtraction to adding the opposite ( keep-change-change ) and then follow the addition rule. Review
13. Multiplying Rules 1) If the numbers have the same signs then the product is positive . (-7) • (-4) = 28 2) If the numbers have different signs then the product is negative . (-7) • 4 = -28
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17. Dividing Rules 1) If the numbers have the same signs then the quotient is positive . -32 ÷ (-8 )= 4 2) If the numbers have different signs then the quotient is negative . 81 ÷ (-9) = -9
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