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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