Estimating Products | MathHelp.com - By MathHelp.com
| 00:0-1 | to estimate the product of 8291 times 27 we first | |
| 00:06 | round so that each number contains only one non zero | |
| 00:09 | digit . So here we round 8291 to the nearest | |
| 00:15 | 1000 . And we round 27 to the nearest 10 | |
| 00:19 | To around 8,291 to the nearest 1000 . The two | |
| 00:23 | to the right of the rounding place tells us to | |
| 00:25 | round down . So 8291 rounds down to 8000 To | |
| 00:34 | around 27 to the nearest 10 , the seven to | |
| 00:37 | the right of the rounding place tells us to round | |
| 00:40 | up . So 27 rounds up to 30 . So | |
| 00:45 | we have 8000 times 30 . Next we line up | |
| 00:49 | the rounded numbers with the larger number on top and | |
| 00:52 | multiply 8000 . Yeah , times 30 . An easy | |
| 01:03 | way to multiply numbers . That end with Zeros is | |
| 01:06 | to first count the total number of Zeros at the | |
| 01:08 | end of the numbers . In this case we have | |
| 01:11 | three zeros at the end of 8001 0 at the | |
| 01:14 | end of 30 . Since we have a total of | |
| 01:17 | four zeros at the end of the numbers are answer | |
| 01:20 | will end with four Zeros . Next we multiply the | |
| 01:28 | non zero digits in this case , that's eight times | |
| 01:31 | three which is 24 . So we put 24 in | |
| 01:35 | front of the four zeros and our answer and we | |
| 01:38 | have 240,000 . So 8000 times 30 is 240,000 . | |
| 01:45 | Which means that 8,291 times 27 is approximately 240,000 . |
DESCRIPTION:
This lesson covers perimeter. Students learn that the perimeter of a figure is the distance around the figure, so the perimeter of a figure can be found by adding the lengths of its sides. Since all four sides of a square are equal in length, the perimeter of a square that has a side with a length of 8 feet is 8 + 8 + 8 + 8, or 32 feet. Since opposite sides of a rectangle are equal in length, the perimeter of a rectangle that is 4.5 meters by 6.2 meters is 4.5 + 4.5 + 6.2 + 6.2, or 21.4 meters.
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