When you divide anything my ten, you move the decimal point one to the left, so the answer is 0.3 . This is the same concept as when you multiply by ten you just add another zero
In order to find the decimal of \(\frac{3}{10}\) we are going to do 3÷10. 3÷10=0.3. So, \(\frac{3}{10}\) as a decimal is \(\boxed{0.3}\). Hoped I helped. :)