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To round any number, look at the digit to the right of the place you are rounding to. If the digit is 5 or more, change the digit in the place you are rounding to to the next higher digit. If the digit to the right of the place you are rounding to is less than 5, leave the digit in the place you are rounding to as it is. Change all digits to the right of the place you rounded to to zeros.

21.51 rounded to the nearest tenth is 21.5

Q: How to round 21.51 to the nearest tenth?

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6.3 is the nearest tenth...

It then is 1.5 when rounded to the nearest tenth