To write 13/20 as a decimal, you divide 13 by 20. When you do this, you get 0.65. So, 13/20 as a decimal is 0.65.
To convert this decimal to a percent, you multiply it by 100. Therefore, 0.65 multiplied by 100 equals 65%. So, 13/20 as a percent is 65%.
In summary, 13/20 is 0.65 in decimal form and 65% in percent form.