A school had 1,200 students last year and only 1,080 students this year. What was the percentage decrease in the number of students? Double number line, number of people, percent.

10%

First off, you need to divide 1200 with 1080.

1200 - 1080 = 120.

Next, divide 120 with the original number.

120 / 1200 = 0.1

Then, multiply 0.1 with 100.

100 x 0.1 = 10

Finally, add a % at the end.

10 -> 10%

So in summary, your answer is 10%