8th Grade Math | MathHelp.com - By MathHelp.com
Transcript
| 00:0-1 | To add the integers negative three plus five , Let's | |
| 00:05 | start with the number line , A number line has | |
| 00:08 | zero in the middle . All numbers to the right | |
| 00:13 | of zero are positive And all numbers to the left | |
| 00:17 | of zero are negative . So starting at zero , | |
| 00:24 | -3 moves us three units to the left . Then | |
| 00:31 | from there , Positive five moves us five units back | |
| 00:37 | to the right , and you can see that we | |
| 00:40 | end up at positive two . So negative 3-plus 5 | |
| 00:48 | equals positive , too . |
Summarizer
DESCRIPTION:
This lesson covers estimating products. Students learn to estimate a product or quotient by first rounding each number to one non-zero digit. For example, to estimate 8,291 x 27, first round 8,291 down to 8,000, and round 27 up to 30, then multiply 8,000 x 30 to get 240,000.
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