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When rounding 281 to the nearest ten, you look at the digit in the tens place, which is 8. Since 8 is greater than or equal to 5, you round up. Therefore, 281 rounded to the nearest ten is 280.
145 is rounded to the nearest ones. 145 rounded to the nearest thousandth is 145.000
35.6
0.17241 is, itself, a decimal.
3.08