Use rounding to estimate the product 12*9. Then, use compensation to find the actual answer. If Alison was rounding to find how much 12 books that were $9 apiece cost, would she get a good estimate? Explain.
12 * 10 = 120
I estimated by rounding 9 up to 10.
12 * 10 = 120
12 * 9 = 108
8267- 2761
Use rounding to estimate the product 12*9. Then, use compensation to find the actual answer. If Alison was rounding to find how much 12 books that were $9 apiece cost, would she get a good estimate? Explain.
going on 2012
To estimate the product 12*9 using rounding, we can round 9 to 10 and multiply 12*10, which gives us an estimate of 120.
To use compensation to find the actual answer, we can find the difference between 9 and 10, which is 1. We can then subtract this difference from the estimate of 120:
120 - 12 = 108
So the actual answer is 108, not the estimated 120.
If Alison was rounding to find how much 12 books that were $9 apiece cost, she would get a good estimate if she rounded each book price to the nearest dollar. However, if she rounded each book price to the nearest ten dollars, the estimate would not be as accurate. It's important to consider the level of rounding used when making estimates.