Multiply and Divide Fractions. Much easier than add & subtract Reciprocal Flip the fraction over If not a fraction, then make it one Multiply Steps –Multiply.

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Presentation transcript:

Multiply and Divide Fractions

Much easier than add & subtract Reciprocal Flip the fraction over If not a fraction, then make it one Multiply Steps –Multiply the numerators  New numerator –Multiply the denominators  New denominator –Reduce

Examples (3/8)(4/9) (-3/4)(8/15) (5/x)(8/y) 3(5/8)

Do It (c/9)(d/7) 8/7 (11) Evaluate xy when x = (-4/5) & y = (6/7)

Short-Cut Reducing before you multiply The rule: Anything in the top with anything in the bottom Examples: (3/8)(4/9) (-3/4)(8/15) (-5/9)(-12) (5/6)(18/25)(5/9)

Try and Try again (-1/3) ( -5/12) (8/15) Find the product of (8/9) and 6 3&(6/7) times 2&(4/9) Evaluate zpy when z = 5&(1/8) and p = 2/3 and y = 1 and t = 49/7

Dividing Fractions Make them easy How? Turn them into a multiplication problem How? Multiply by the reciprocal. Flip the second fraction over. Always the second fraction!

Examples 2/5 divided by ¾ -7/10 divided -14/15 2/3 divided by 1&1/4

Divide! 5/6 divided by 10/27 Find the quotient of 4 and -6/7 4&3/8 Divided by 3&1/2 x/8 divided by y/6

Homework EOO No geometry! a&b