The digit at the fourth decimal place is 5.
The next digit, 7 is bigger than 5 and so the digit at the fourth decimal place must be rounded up - to 12.4286
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0.017 is a number which is given to 3 decimal places. The equivalent number, at four decimal places, is 0.0170 but any number in the interval (0.0165, 0.0175), when rounded to four decimal places would give 0.017 to three.
It's 0.81818181818181
It is 0.811111 = 811111/1000000 which cannot be simplified.
It is four and eleven hundredths to three decimal places.
Well, honey, to write four and two tenths percent as a decimal, you just move that decimal point two places to the left. So, you end up with 0.042. Easy peasy lemon squeezy!