To do this simply see how many times 10 can go into 124.
It can go in 12 times right?
12 is your whole number.
The four is still left and it is going to stay there. So right now you have:
12 and 4/10
4/10 can be simplified by dividing it by 2.
This leaves you with 2/5
Your answer is 12 and 2/5