2.5 and 2.6 Multiplication and Division of Rational #’s.

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Presentation transcript:

2.5 and 2.6 Multiplication and Division of Rational #’s

When Multiplying and Dividing :  Positive Positive = Positive  Positive Negative = Negative  Negative Negative = Positive  Anything multiplied by ZERO is ZERO

Easy way to remember When multiplying or dividing the same sign your answer is positive When multiplying or dividing different signs your answers is negative

The Good and Bad People Rules When good things happen to good people, that’s good Examples: 4 x 6 =24 21 ÷7 =3 When bad things happen to good people, that’s bad. Examples: -4 x 6 = ÷ 7 = -3 When good things happen to bad people, that’s bad. Examples: 4 x -6 = ÷ -7 = -3 When bad things happen to bad people, that’s good. Examples: -4 x -6 = ÷ -7 = 3

-18

-6

How To Multiply Decimals multiply Count how many decimal places you have and then move the decimal to the left depending that many times

(3.25) (-4.05) 325 x

Multiply Fractions Multiply the numerators, then multiply the denominators and reduce You may always cross cancel first

66 66 -3 1

1 4 3

120 4(-5)(-3)(2) = (-20)(-3)(2) = (60)(2) = Shortcut: If the number of negative factors is an even number, then the product will be a positive number.

Multiply: -120

Multiplication Property of Zero Anything multiplied by zero is zero

Multiply: 0

0

Assignment: Workbook Page 13 (20-43) all