Estimating Quotients | MathHelp.com - By MathHelp.com
Transcript
| 00:0-1 | to estimate the quotient of 3785 divided by 413 . | |
| 00:06 | We first round so that each number contains only one | |
| 00:10 | non zero digit . So rounding 3785 to the nearest | |
| 00:15 | 1000 the seven to the right of the rounding place | |
| 00:18 | tells us to round up . So 3785 rounds up | |
| 00:23 | to 4000 . Rounding 413 to the nearest 100 . | |
| 00:31 | The one to the right of the rounding place tells | |
| 00:33 | us to round down . So 413 rounds down to | |
| 00:37 | 400 . So we have 4000 divided by 400 or | |
| 00:45 | 400 , divided into 4000 . Yeah , just like | |
| 00:53 | a multiplication problem , a division problem becomes easier if | |
| 00:57 | our numbers end in zeros since 404,000 , both end | |
| 01:01 | in two zeros , we can cancel the last two | |
| 01:05 | zeros in each number . So our problem now reads | |
| 01:08 | four divided into 40 Dividing for into 40 . We | |
| 01:13 | can see that four divides into 4 . 1 time | |
| 01:16 | one times four is four . So we put four | |
| 01:19 | under four and subtract 4 -4 is zero . Next | |
| 01:25 | we bring down the zero to get zero . Four | |
| 01:28 | divides in 200 times zero times four is zero . | |
| 01:34 | So we put zero under zero and subtract zero minus | |
| 01:38 | zero is zero , So 4000 divided by 400 is | |
| 01:42 | 10 , which means that 3,785 divided by 413 is | |
| 01:48 | approximately 10 . |
Summarizer
DESCRIPTION:
This lesson covers commutative property of multiplication, which states that a x b = b x a. For example, 10 x 4 = 4 x 10.
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