Hi there!
We can start by making the fraction 24/100.
To put this into lowest terms, we can divide both the numerator and the denominator by a common multiple. For instance, we could start with 2, since they both divide equally into 2.
24/2=12
100/2=50
We end up with 12/50 - but we can divide both these numbers of 2 again! So we continue.
12/2=6
50/2=25
6/25 is your answer!
Hope this helps!