Getting a fraction (numerator over denominator) into decimal means proper (complete) division. Ok there's a long and short 'official' method. Short one only (not sure of your age so sorry in advance) So numerator 1 can also be written as 1.000. (it's easier not to). In division, we take the 5 on the bottom, check how many times it goes into each digit of the number on top. So in this case the number on top is 1.0000. So first digit is 1. 5 goes into 1, zero times! So write a zero down. '0' Then there's a decimal place so write that down after zero. '0.' Next there is a zero after the decimal place in the numerator. 1.(0)00. Now we take that 1 which the 5 didn't go into and line it up next to this next zero to make 10 (ten, we can do this cos we're only talking digits here, its only for this calculation). 0.(10)00 We've taken the remainder from the previous digit (which was the whole digit) and added it to the next one along. how many times does 5 go into 10? 2! So write down 2 next to '0.' in your answer. '0.2' Now the only digits left to check in the numerator are all zeros (infinite zeros). 5 doesnt go into any of them and there are no remainders, so '0.2' is the final answer.