The answer will depend on the degree of rounding required which, unfortunately, is not specified. This should be in terms of the number of decimal digits or significant figures - both of which are the same in this case.
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15/72 1/7:= [(7 * 2)+1]/7= [14 + 1]/7= 15/7 in improper fraction
Say you have the fraction 2/7. that would round to zero. What if you have 3/5? That could equal 1 or 1/2. People do it all differently, so there is actually no correct answer. Ask your teacher if your answer is correct. If your answer is pretty close, that could be correct to others.
7 as an improper fraction would be 7 over 1 or 7/1
Since 1/7 is an infinite repeating decimal, the answer will depend on the number of digits to which the answer needs to be rounded. To 15 decimal places, for example, it is 0.142857142857143
3 1/7:= [(7*3)+1]/7= [21+1]/7= 22/7 in improper fraction