what is 3.42 reapeating in simplest form

I assume we have  3.424242......

Take the repeating and non-repeating part [ without the decimal ] and subtract the non-repeating part

[ 342  - 3 ]   =  339    (1)

Write  an integer with the same number of "9s"  as the number of repeating digits   = 99     (2)

Put    (1)  over (2)  =

339  / 99

Check to see that     339 / 99  =   3.424242......