Multiplying Fractions | MathHelp.com - Free Educational videos for Students in K-12 | Lumos Learning

Multiplying Fractions | MathHelp.com - Free Educational videos for Students in k-12


Multiplying Fractions | MathHelp.com - By MathHelp.com



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00:0-1 to multiply to ninth times 9/10 . We can simply
00:04 multiply across the enumerators and across the denominators two times
00:08 nine is 18 , and nine times 10 is 90
00:13 . So we have 18/90 to get 18/90 . In
00:17 lowest terms we divide the numerator and denominator by the
00:22 greatest common factor of 18 and 90 , which is
00:25 18 To get 1/5 . There's an easier way to
00:33 do this problem . However , let's rewrite the problem
00:37 . 2/9 times 9/10 . When multiplying two fractions always
00:45 try to cross cancel if possible . For example ,
00:50 since we have a two in the numerator of one
00:52 fraction and attend in the denominator of the other fraction
00:56 , we can cross cancel by dividing by their greatest
01:00 common factor which is to To get one and 5
01:06 . And since we have a nine in the denominator
01:08 of one fraction and a nine in the numerator of
01:11 the other fraction . We can cross cancel by dividing
01:15 by their greatest common factor which is nine to get
01:18 one and one . Now we simply multiply across the
01:23 numerator and across the denominators one times one is one
01:29 and one times 5 is five , So we have
01:33 1 5th notice that we get the same answer by
01:37 doing this problem either way , but I would recommend
01:41 using cross canceling .
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