1.0 if the same number is permitted. If not, there is no such thing as a CLOSEST decimal. If you are given one decimal with the claim of being the closest, the average of that number and 1 will be a decimal that is closer.
Without averaging, the closest would be 0.999 with infinite 9s
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Most people will probably go for 1. But the answer depends on how comfortable you are with numbers.
The only decimal value that is closest to 4.75 is is 4.749̅ [9̅ represents the repeated digit value for the term.]
The only possible answer is 0.75 since for any other decimal number, there are infinitely many decimal numbers which are closer.
1-sixth in decimal form = 0.01671/6:= 1 ÷ 6= 0.0167 in decimal
1 sixth as a decimal is 1/6 or 0.166667.