To find three equivalent fraction for 4/20, we can multiple 4/20 by the equivalent of 1/1. For example:
4/20 x 1/1 = 4/20
since 1/1 = 1 and multiplying by 1 does not change the value.
If we multiply:
4/20 x 2/2 = 8/40
Here again, since 2/2 = 1 we aren't changing the value, just the way it is written.
We could also multiply by 3/3, 4/4, 5/5 and so on to find more fractions that are equal to 4/20. As long as we are multiplying by the equivalent of 1, we'll get a fraction that is the same as 4/20.