Here's an easy trick...
This is what my tutor taught. You simply that the all of the numbers you got in your decimal, put them backwards then subtract them by all of the numbers normally. So here's an ex. lets say you have 0.532569.
Take that and put it like this: 9652350-0532569.
When you get your response, just add back on the decimal. (That was for any rounding to the nearest whatever).
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100.00
From the decimal, and going right each number holder following it is tenths, hundredths,thousandths and ten thousandths So, your hundredths place number is 8. The next number, if it is 5 or above, we will round our hundredth number of 8 up to 9. Yes, the next column to the right is 9 so we will round up the 8 to 9 and drop the rest of the digits. The answer is then 6.79, to the nearest hundredth.
6/7 and you cant reduce so its 6/7
42/2pi is 6.68inches
Since you haven't given us any data to work with - we cannot help you !