If you mean 3/10 then as a decimal it is 0.3
it is 3 and 8/10ths.
8 10ths = 8/10. Multiply both the numerator (top) and the denominator (bottom) of the fraction by any non-zero integer. Any will do. You will have an equivalent fraction.
Since 0.8 is equal to 8/10ths, -0.8 is equal to -8/10ths and -0.80 is also equal to -8/10ths. If you simplify -8/10ths by dividing the numerator and the denominator by 2 you get :-4/5ths
0.3 is a already written as a decimal. It is the decimal version of 3/10ths.
0.6 decimal is = six tenths as a fraction or 6 /10ths