Answer :

viperine1501
you can multiply a fraction by a whole number by ONLY multiplying the numerator which is the top number on the bar. for example:
                                          
                                            2 x 3/4 = 6/4 = 1 2/4
multiply the whole number with the numerator |remember the numerator is the top and the denominator is the bottom| or you can just do |example|

              2.then you flip the fraction and you get 2/1.
1/2 * 20 = 2/1* 20/1=40/1 
         3.always put 1 under a whole number when it comes to multiplying fractions with whole numbers.

4. then you just multiply, you're suppose to multiply 20*2 and 1*1.
5. then you divide 40 and 1 so you get 40