So first you take the 1/3 and put it into decimal form which is 0.33333333333
Then you can take your 0.33333333333 and multiply it by the 3 and you will get 1. (Note: if you try and simplify the 0.33333333333 to anything like 0.33 you will NOT get 1 you will get things like 0.99 and 0.999)
I hope this helped you and I hope that you understand now! :)
