My Math Forum Multiplying 3 or more fractions..

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 September 22nd, 2008, 10:29 AM #1 Member   Joined: Sep 2008 Posts: 97 Thanks: 0 Multiplying 3 or more fractions.. How do you multiply three or more fractions at a time? Example: 2 1/2 x 4 x 3/5? I know that 4 becomes a reciprocal. 2 1/2 x 4/1 x 3/5? What do you do after this?
 September 22nd, 2008, 12:11 PM #2 Senior Member   Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3 Re: Multiplying 3 or more fractions.. Be careful with your notation there. The reciprocal of a number is 1/number. So the reciprocal of 4 is 1/4... Anyway, Make all of the numbers improper fractions: 2 1/2 x 4 x 3/5 -> 5/2 x 4/1 x 3/5 Then multiply the numerators and multiply the denominators: 5*4*3 = 60 2*1*5 = 10 The product of the numerators becomes the new numerator and the product of the denominators becomes the new denominator: 60/10 Then reduce: 6

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