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algol13
4 years ago
7

A. Round to the nearest hundredth

Mathematics
1 answer:
aniked [119]4 years ago
4 0

a. Rounding to the nearest hundredth  means that we only have access to numbers with 2 decimal digits. Our number is enclosed between 45.28 and 45.29. Which one is a better approximation? Well, the one who's closer! To tell how "close" two numbers are, just compute the absolute value of their difference:

|45.28502
-45.28|=0.00502,\quad |45.28502
-45.29|0.00498

So, the distance from 45.29 is less than the distance from 45.28, which makes 45-29 the best approximation.

b. Rounding to the nearest integer  means that we can't use decimal digits at all. By the same logic of case (a), we have to choose between 27 and 28: we have

|27.499-27|=0.499,\quad |
27.499-28|=0.501

Which makes 27 the best approximation

c. Rounding to the nearest tenth  means that we can only use one decimal digit. Again, the logic is always the same: the number lies between 0.2 and 0.3, and we use the same test to check which is a better approximation:

|0.224-0.2|=0.024,\quad |0.224-0.3|=0.076

Which makes 0.2 the best approximation.

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