Glencoe Mathematics - Math Homework Help - MathHelp.com - By MathHelp.com
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| 00:0-1 | The following is a selected video from your teacher.com where | |
| 00:03 | you can browse over 450 complete math lessons with example | |
| 00:07 | videos , interactive practice problems , self tests and more | |
| 00:11 | . Try a complete lesson today at your teacher dot | |
| 00:14 | com to add these two fractions together . 16 plus | |
| 00:21 | 4/5 . We need a common denominator . The common | |
| 00:27 | denominator is simply the least common multiple For the two | |
| 00:32 | denominators . So here our first step is to find | |
| 00:35 | the least common multiple For six and 5 . Six | |
| 00:42 | factors as three times two And five dozen factor . | |
| 00:48 | Remember when finding the least common multiple ? We're looking | |
| 00:52 | for factors that match up and here we have no | |
| 00:56 | factors that match up . So at least common multiple | |
| 00:59 | or L C . M is simply three times two | |
| 01:04 | times five or six times five which is 30 . | |
| 01:11 | So at least common denominator for these two fractions his | |
| 01:15 | 30 . In order to get a denominator of 30 | |
| 01:20 | in the first fraction We must multiply our denominator of | |
| 01:24 | six by five . The problem is we can't just | |
| 01:31 | multiply the denominator of a fraction by five because that | |
| 01:35 | changes its value . However , if we also multiply | |
| 01:41 | The numerator of the fraction by five , We're actually | |
| 01:45 | multiplying the fraction by 5/5 which is one . And | |
| 01:51 | when we multiply anything by one , it doesn't change | |
| 01:55 | its value . So our first fraction becomes five over | |
| 02:01 | 30 . Notice that 5/30 has the same value , | |
| 02:08 | has won over six for our second fraction we have | |
| 02:13 | a five in the denominator And we want a common | |
| 02:16 | denominator of 30 . So we must multiply this five | |
| 02:20 | by six . And when we multiply the denominator refraction | |
| 02:26 | by six , we must also multiply The Numerator by | |
| 02:30 | six . So we have plus 24 . Okay , | |
| 02:36 | over 30 5/30 plus 24/30 is 29/30 , which is | |
| 02:50 | our final answer . |
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