Lowest Common Denominator | Subtracting Fractions | MathHelp.com - By MathHelp.com
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| 00:0-1 | to subtract . Unlike fractions such as 7 12 minus | |
| 00:04 | one third . First find a common denominator . The | |
| 00:08 | common denominator of 12 and three is the least common | |
| 00:11 | multiple of 12 and three , which is 12 . | |
| 00:15 | notice that our first fraction already has 12 in the | |
| 00:18 | denominator , so it stays the same To get 12 | |
| 00:23 | in the denominator of 1/3 . We multiply the numerator | |
| 00:26 | and denominator by four . Yeah To get 4 12 | |
| 00:32 | And we have 7/12 -4/12 . Now we're subtracting like | |
| 00:37 | fractions , so we simply subtract the numerator and keep | |
| 00:41 | the denominator the same 7 -4 is three and we | |
| 00:45 | have 3/12 . Now remember that we want to write | |
| 00:49 | our answer in lowest terms . So we need to | |
| 00:52 | divide the numerator and denominator by three To get 1 | |
| 00:58 | 4th , So 7 12th -1 3rd is 1 4th | |
| 01:05 | which is in lowest terms . |
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