Math Percentages | MathHelp.com - By MathHelp.com
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| 00:0-1 | I know that it's tempting to try to do percentage | |
| 00:03 | word problems in your head , but this leads to | |
| 00:07 | a variety of careless mistakes . So I would advise | |
| 00:11 | always writing out the equation by simply reading the problem | |
| 00:16 | from left to right and solving it from there . | |
| 00:21 | That way you don't have to think about the problem | |
| 00:23 | at all until you get to your final answer . | |
| 00:28 | So for this problem we have what percent ? Since | |
| 00:33 | we know that percent means over 100 and what means | |
| 00:39 | X what percent would be X over 100 of means | |
| 00:50 | times 36 is 36 is means equals and 81 is | |
| 01:01 | 81 . We can rewrite this problem as 36 x | |
| 01:09 | over 100 equals 81 to get rid of the fraction | |
| 01:17 | . We multiply both sides by 100 . Yeah . | |
| 01:24 | Yeah . And we have 36 x equals 8100 , | |
| 01:34 | dividing both sides by 36 . You can use a | |
| 01:40 | calculator to find that X equals 2 25 . Now | |
| 01:51 | let's check to see if our answer makes sense . | |
| 01:55 | We have 225 of 36 is 81 . Well , | |
| 02:07 | we know that 100 of 36 Would be 36 , | |
| 02:14 | So 225 of 36 Should be a lot more than | |
| 02:20 | 36 . So 81 seems to make sense . |
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