I know how to round a 3-digit number to the nearest 10 and nearest 100.
When rounding a 3-digit number to the nearest 10, look at the ones digit. If the ones digit is 5 or more, round up by increasing the tens digit by 1. If the ones digit is 4 or less, round down by not changing the tens digit. Then, change the units digits to 0.
When rounding a 3-digit number to the nearest 100, look at the tens digit. If the tens digit is 5 or more, round up by increasing the hundreds digit by 1. If the tens digit is 4 or less, round down by not changing the hundreds digit. Then, change the units and tens digits to 0.
Have a look at this video if you need to learn how to round a number to the nearest hundred.
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