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To round the tenths you look at the hundredth column, which in this case is a 7. Since 7 is greater than 5 we round up, but since 9 can't round up anymore we have to round the ones column. Thus rounding 23.971 by the tenths = 24.0 (The zero is necessary to show that you've rounded the number by the tenths and not the ones.)

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15y ago

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