Answer: 1.67% decrease
Step-by-step explanation: First determine whether
the number increases or decreases.
Here, since the number changes from 1200 to 1180,
it's getting smaller so it decreases.
To find the percent decrease, we use the following formula:
Amount of Change / Original Number
The Amount of Change is the difference between
the two numbers which here, is 1200 - 1180 or 20.
We always subtract the larger number minus the smaller number when finding the amount of change to keep our percent change positive.
Now we divide 20 by the original number, 1200,
and we get .0167.
Finally, we want the percent decrease so we need to right .0167 as a percent by moving the decimal point two places to the right.
So we get 1.67%
This means that when the enrollment in 7th grade went from 1200 students to 1180 students, there is 1.67% decrease.