How do you make 1 whole in to a fraction?

bottom number = top number = 1

A bit more:

Since a fraction is actually the division of the top number by the bottom number (such as 1/2 which is 1 divided by 2), a fraction where the top and bottom numbers are the same will equal 1.

For example, 5/5 is 5 divided by 5, which is 1. Other examples:

1/1; 3/3/; 7/7; 21/21, etc. Each of these fractions equals 1 whole.