6
Look at the tenths digit - if it is 4 or less round down, if it is 5 or more round up.
The tenths digit is 4, so round down
6.4 → 6 to the nearest whole number.
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To round 63.75 to the nearest whole number, we look at the digit in the tenths place, which is 7. Since 7 is 5 or greater, we round the whole number up. Therefore, 63.75 rounded to the nearest whole number is 64.
1064 has exactly 64 zeros in it when it's expanded.Any number greater than 1064 rounded to the nearest 1064 has at least 64 zeros.
The number cannot be 64 when rounded to 1 sf.
100
2.3