% of Total or % of a Number

CONCEPTS

% of total or % of a number

• New amount = Original * %

Tips

• A % can be written as a decimal or a % (0.5 = 50%)

PRACTICE PROBLEMS

Question 1 If there are 8 tests in a class that include 6 exams and 2 quizzes, what % of tests are exams?

-- Answer -- 75%

6 / 8 = 3 / 4 = 75%

Question 2 What is 5% of 9?

-- Answer -- 0.45

5% * 9 = 0.05 * 9 = 0.45

Question 3 8% of 60 is 1/5 of what number?

-- Answer -- 24

8% * 60 = 1/5 * x

0.08 * 60 = 0.2 * x, x = 24

ACT PRACTICE PROBLEMS

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