20.5
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When rounding a number to the nearest tenth, you look at the digit in the hundredths place. Since the digit in the hundredths place is 5 or greater, you round up the digit in the tenths place. Therefore, 20.5 rounded to the nearest tenth is 20.5.
Well, isn't that a happy little question! When we round 20.5 to the nearest tenth, we look at the number right next to the tenths place. Since 5 is greater than or equal to 5, we round up. So, 20.5 rounded to the nearest tenth is 20.6. Just a little adjustment to make everything nice and balanced!
Since the tenth place is one digit to the right of the decimal, 20.5 is already rounded to the nearest tenth.