What the divided sign is, is basically just a division sign. So, to get the decimal, you do 1÷5 . This makes you get 0.2 . Now, you need a percentage. A percentage is a number over 100 . To get 5 to 100 , you multiply it by 20 , and do the same for 1 , leaving you with 20100 . So, your percentage is 20% .