Learning Target I can multiply and divide integers. Common Core Standard: 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
Multiplying fractions: Examples 1) (3x)(-8y) -24xy 2) Write both numbers as a fraction. Cross-cancel if possible. Multiplying fractions: top # • top # Bottom # • bottom# = -16
When multiplying two negative numbers, the product is negative. True False Answer Now
When multiplying a negative number and a positive number, use the sign of the larger number. True False Answer Now
3) = =
Multiply: (-3)(4)(-2)(-3) 72 -72 36 -36 Answer Now
What is the sign of the product of (-3)(-4)(-5)(0)(-1)(-6)(-91)? Positive Negative Zero Huh? Answer Now
an easy way to determine the sign of the answer When you have an odd number of negatives, the answer is negative. When you have an even number of negatives, the answer is positive. 4) (-2)(-8)(3)(-10) Do you have an even or odd number of negative signs? 3 negative signs -> Odd -> answer is negative -480
Positive or negative answer? Positive - even # of negative signs (4) Last one! 5) Positive or negative answer? Positive - even # of negative signs (4) Write all numbers as fractions and multiply. =12
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
When dividing two negative numbers, the quotient is positive. True False Answer Now
When dividing a negative number and a positive number, use the sign of the larger number. True False Answer Now
What is the quotient of -21 ÷ -3? 18 -18 7 -7 Answer Now