Question

Mrs. Bennett has graded 20% of her 150 students' papers. How many papers does she still need to finish grading?

Answer 1

`120` papers are left to be graded.

Explanation:

You can start by either calculation how many she has done already, or by calculating what percent is left still to do.

Find `20% " of " 150`

`20/100 xx 150 = 30` papers are done.

`150-30 = 120` papers are still left to do.

OR:

If 20% are done, then `100%-20% = 80%` are still left.

Find `80% " of "150`

`80/100 xx 150 = 120` papers are still left