need to solve this question with calculations (explanation) for beginners

Question

2 1/4m of cloth is required to stitch a shirt. how many shirts can be stitched out of 100m of cloth?

Answer 1

So 2 1/4 can also be written as 9/4. 

 

When you divide 100 m by 9/4 m, you get 100 * 4/9, and the rest I think you can solve on your own.