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
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
When multiplying two negative numbers, the product is negative.
When multiplying a negative number and a positive number, use the sign of the larger number.