Pre-Algebra Practice Test: Decimals and Percents
- Decimals and Percents
- 10 questions
- 14 minutes
This test covers adding, multiplying and dividing decimals, converting between fractions, decimals and percents, and percent word problems. Tip: percent change is always found by dividing by the original amount.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
What is 4.7 + 0.36?
Correct answer: A
Line up the decimal points: 4.70 + 0.36 = 5.06. The answer 0.83 adds 47 and 36 as if both had two decimal places.
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Question 2
What is 3.2 × 0.15?
Correct answer: C
32 × 15 = 480, and the factors have 1 + 2 = 3 decimal places in total, so the product is 0.480 = 0.48.
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Question 3
What is 7.2 ÷ 0.08?
Correct answer: B
Move both decimal points two places right: 720 ÷ 8 = 90.
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Question 4
What is 0.375 written as a fraction in simplest form?
Correct answer: D
0.375 = 375/1000, and dividing top and bottom by 125 gives 3/8.
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Question 5
What is 35% of 80?
Correct answer: A
35% = 0.35, and 0.35 × 80 = 28. The answer 45 subtracts 35 from 80.
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Question 6
What is 35 written as a percent?
Correct answer: C
3 ÷ 5 = 0.6, and 0.6 = 60%. Writing the digits 3 and 5 next to each other gives 35%, which is wrong.
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Question 7
A jacket costs $64. It is on sale for 25% off. What is the sale price?
Correct answer: D
The discount is 25% of $64 = $16, so the sale price is $64 − $16 = $48. $16 is the discount, not the price.
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Question 8
18 is what percent of 72?
Correct answer: B
18 ÷ 72 = 0.25 = 25%. The answer 4% comes from dividing 72 by 18.
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Question 9
The price of a game rose from $40 to $50. What was the percent increase?
Correct answer: C
The increase is $10, and you divide by the original price: 10 ÷ 40 = 0.25 = 25%. Dividing by the new price gives 20%.
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Question 10
Which list orders the numbers 0.6, 0.58, 0.605 and 0.5 from least to greatest?
Correct answer: D
Compare with the same number of decimal places: 0.500, 0.580, 0.600, 0.605. A longer decimal is not automatically larger.
Questions you leave blank are not counted as wrong.
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