What is bigger 0.3 or 0.6?

0.6 > 0.3 .

To compare decimals.

Bring both to the same number of decimal places, by adding suffix zeroes. '1' d,p. in this case.

Drop the decimal point

06 & 03

Drop the prefix zero

6 & 3

I'm sure you will agree that 6 is greater than 3 .

Shown algebraically as 6 > 3, and as decimals 0.6 > 0.3