The bakery has 4 cakes. one-quarter of the cakes have pink frosting. how many cakes at the bakery have pink frosting?

4 *1/4 = 1 
1 of the cakes has pink frosting.

You want to find 1/4 of 4 cakes, which we can do by multiplying these values
4*1/4 (multiply numerators by each other and denominators by each other)
4/4 (divide numerators and denominator by 4)
=1 cake

Hope this helps