What is 13/21 divided by 84?
13/21 / 84 = 13/21 / 84/1 = 13/21 x 1/84 = 13/1764
All you need to do for dividing fractions by whole numbers is know that you will be getting a smaller number.
A good method is to multiply the dividend by the divisor's reciprocal.
Such as,
(13 / 21 )*(1 /84) = 13 / 1701
+1491 
