If Joe has 5 rabbits and 1/5 of those rabbits are white, then we just have to multiply...

5 can be transformed into a fraction by simply putting a 1 below it, so the problem looks like this:

Now we just multiply the numerators together and then multiply the denominators together. Numerators are the numbers on the top of fractions and denominators are on the bottoms.

Since any number times 1 equals the same number, the fraction now looks like this:

Any number divided by itself is 1, so we end up with

If Joe has 5 rabbits and 1/5 of them is white, then 1 of Joe's rabbits is white.
Hope that helped =)