To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the ones place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
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14.7 fps
Nearest 10 of 254 = 250
No. 395 to the nearest 10 is 400.
120.0
The length is accurate to the nearest 10 micrometres.The length is accurate to the nearest 10 micrometres.The length is accurate to the nearest 10 micrometres.The length is accurate to the nearest 10 micrometres.