When rounding 2.64 to one decimal place, you look at the digit in the second decimal place, which is 4. Since 4 is less than 5, you simply truncate the number after the first decimal place. Therefore, 2.64 rounded to one decimal place is 2.6.
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Anything to one decimal place has a precision of one decimal place. For instance, 1234 to one decimal place is 1000, and 5678 to one decimal place is 6000. If you are talking fractional examples, then 0.1234 to one decimal place is 0.1 and 0.5678 to one decimal place is 0.6. Similarly, 0.001234 is 0.001, and 0.005678 is 0.006.
63.999 to one decimal place = 64.0
It is then 3.4 rounded up to one decimal place
81.7 to one decimal place is 81.7
A number expressed to one decimal place (not one place decimal) is one that has a single digit after the decimal place. This is the digit in the tenths place so such a number may also be described as "rounded to the nearest tenth", or "accurate to a tenth".