Math Ratios | MathHelp.com - By MathHelp.com
| 00:0-1 | The ratio of one number to another is the result | |
| 00:04 | of the first number divided by the second number . | |
| 00:09 | For example , in the diagram shown , if we're | |
| 00:13 | asked to find the ratio of the measure of angle | |
| 00:15 | A to the measure of angle be . We take | |
| 00:19 | the measure of angle A . Yeah , divided by | |
| 00:26 | the measure of angle be . And since the measure | |
| 00:30 | of angle a is 60° And the measure of Angle | |
| 00:34 | B is 80°, , we have 60/80 . Yeah . | |
| 00:44 | Notice that 60/80 can be reduced because 60 and 80 | |
| 00:49 | have a greatest common factor of 20 . So we | |
| 00:53 | divide both 60 and 80 by 20 . Yes . | |
| 01:00 | Mhm . To get three over four . So the | |
| 01:08 | ratio of the measure of angle a to the measure | |
| 01:11 | of Angle B is 3/4 . Remember to always reduce | |
| 01:17 | if possible when finding a ratio . It's important to | |
| 01:22 | understand that a ratio can be written in three different | |
| 01:26 | ways . For example , the ratio 3/4 can also | |
| 01:32 | be written as 3-4 Or 3:4 . Mhm . Make | |
| 01:45 | sure you're familiar with all three ways to write a | |
| 01:49 | ratio |
DESCRIPTION:
This lesson covers adding decimals. Students learn to add decimals by first lining up the decimal points, then adding the numbers by column. For example, to add 14.2 + 2.86, first line up the decimal points, then add the digits in the hundredths column, to get 0 + 6, or 6, then add the digits in the tenths column, to get 2 + 8, or 10, so write a 0 in the tenths column and carry the 1 to the units column, then add the digits in units column, to get 1 + 4 + 2, or 7, then add the digits in the tens column, to get 1. So 14.2 + 2.86 = 17.06.
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