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

1 Answer
Nov 17, 2016

Answer:

#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