Calculate a number from a percent

Objectives
Student will be able to:
  • compute a number from a given percentage.

Exercises

Complete the exercises. Show all work.

1.
It rained on 18 days during the summer vacation. This was 25% of the total number of days. How many days long was the summer vacation?
 
Summer vacation was 72 days long.
Check student's work.
1.
 

2.
Kelly got 36 questions correct on a multiple choice test. Her score was 90%. How many questions were on the test?
 
There were 40 questions on the test.
Check student's work.
2.
 

3.
There are 342 seventh graders in a junior high school. This represents 38% of the total number of students in the school. How many students are there in the school?
 
There are a total of 900 students in the school.
Check student's work.
3.
 

4.
Tina paid $900 in sales tax on her new car purchase. The sales tax rate is 6%. What was the cost, before tax, of the new car?
 
Tina's car, before taxes, was $15,000.
Check student's work.
4.
 

5.
Roberto made 119 foul shots this season. This was 85 percent of his total number of shots. How many shots did Roberto not make?
 
Roberto did not make 21 shots.
Check student's work.
5.
 

6.
A certificate of deposit pays 5% annual interest. Iris earned $600 in interest last year. How much did she invest?
 
Iris invested $12,000.
Check student's work.
6.