40
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When rounding a number to the nearest 10, you look at the digit in the tens place. In this case, the digit in the tens place is 3. Since 3 is less than 5, we round down. Therefore, 39.5 rounded to the nearest 10 is 40.
400
400
10 because 8 is to small to have this and 10 is the first ten there is
Rounded to the nearest ten it is 10 but rounded to the nearest tenth it is 12.6
70