It is easy to convert 0.3 to fraction form
Just follow this steps;
First read 0.3
0.3 is read as (three tenths)
Just what you heard by reading of it,you can hear the word "tenths" which means number 10 is you're denominator as of 3 is you're numerator.So the final outcome is;
3/10
I hope I helped you
--------Domini--------
