Question

A piece of cardboard had 2/5 of its usable area cut off. How much of the original piece of cardboard remains?

Answer 1

A whole piece of cardboard is `5/5` or 1 piece of cardboard.

If `2/5` was taken away we can subtract this from the original piece giving:

`5/5 - 2/5 = (5 - 2)/5 = 3/5`

`3/5` of the piece of cardboard is left.