Rounding means making a number simpler but keeping its value close to what it was. The result is less accurate, but easier to use. 73.67532 can be rounded to 74.
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Numbers can be rounded to 400 if they fall within the range of 350 to 449. This range includes all numbers from 350.5 to 449.49, as they would round up to 400. Therefore, there are 100 numbers that can be rounded to 400.
Ten whole numbers can be rounded to 30. The numbers are 25, 26, 27, 28, 29, 30, 31, 32, 33 and 34. There are an infinite number of complex numbers in the interval [25,35) that can be rounded to 30.
All of these numbers can be rounded to the nearest tenth of an inch.
Ten of them.
Usually numbers are rounded to numbers, not letters.