Here's a really simple way to make 4 rags from one old t-shirt in 2 cuts.
All you need is:
An old t-shirt, or better yet a bunch of them
A sharp box knife (be careful, they can be dangerous)
A sold cutting board or workbench
It's all spelled out in the video.
They're handy to have around the garage for working on your bicycle, car and such. A great way to recycle old shirts.
Step 1: Fold in Half Like This
You should see one side of the shirt. The sleeves will be in the middle of the shirt, one on top and one underneath.