Few tricks

1) 0.6666...

to convert 0.6666... to fraction, we know 6 is repeated every time.i.e there is only 1 digit repetition so I will divide 6 by single digit 9

so, i can write it as 6/9

2) 0.46464646...

here 46 is repeated so there are 2 digits

fraction is 46/99

3)0.23434343434...

here we can see that after 0.2 , 34 is repeated
fraction = ( decimal - non repeated decimal)/(9 digits equal to no of repeated decimals * 10^(no of non repeated decimal))

looks complicated, but it is actually not

fraction = (234 - 2)/(99 * 10^1) = 232/990

4)0.1234343434.....

fraction = (1234-12)/(99 * 10^2) = 1222/9900

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