Decimals are a fundamental numerical system used to represent both whole numbers and fractions with precision. They employ a decimal point to separate the integer part from the fractional part, such as in 3.14, where 3 is the whole number and .14 denotes fourteen hundredths. Originating from ancient mathematical practices and formalized in the decimal system by mathematicians like Simon Stevin in the 16th century, decimals provide an efficient way to express values in everyday contexts like money (e.g., $4.99), measurements (e.g., 2.5 meters), and scientific calculations (e.g., π ≈ 3.14159). Their base-10 structure aligns with the human counting system, making them intuitive for addition, subtraction, multiplication, and division, while also facilitating conversions to fractions or percentages for broader applications.
Table of contents
- Part 1: OnlineExamMaker AI quiz generator – The easiest way to make quizzes online
- Part 2: 20 decimals quiz questions & answers
- Part 3: Automatically generate quiz questions using AI Question Generator
Part 1: OnlineExamMaker AI quiz generator – The easiest way to make quizzes online
Are you looking for an online assessment to test the decimals knowledge of your learners? OnlineExamMaker uses artificial intelligence to help quiz organizers to create, manage, and analyze exams or tests automatically. Apart from AI features, OnlineExamMaker advanced security features such as full-screen lockdown browser, online webcam proctoring, and face ID recognition.
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● AI Exam Grader for efficiently grading quizzes and assignments, offering inline comments, automatic scoring, and “fudge points” for manual adjustments.
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● Handles large-scale testing (thousands of exams/semester) without internet dependency, backed by cloud infrastructure.
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Part 2: 20 decimals quiz questions & answers
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1. What is the sum of 3.25 and 4.75?
A. 7.00
B. 8.00
C. 8.50
D. 9.00
Answer: B
Explanation: Adding 3.25 and 4.75 gives 8.00 because 3 + 4 = 7 and 0.25 + 0.75 = 1.00, so 7 + 1.00 = 8.00.
2. Which decimal is equivalent to the fraction 1/2?
A. 0.02
B. 0.2
C. 0.5
D. 0.50
Answer: C
Explanation: 1 divided by 2 equals 0.5, so 0.5 is the decimal equivalent of 1/2.
3. What is 5.6 multiplied by 2?
A. 7.6
B. 10.2
C. 11.2
D. 11.6
Answer: C
Explanation: Multiplying 5.6 by 2 gives 11.2 because 5 × 2 = 10 and 0.6 × 2 = 1.2, so 10 + 1.2 = 11.2.
4. Convert 0.75 to a fraction.
A. 3/4
B. 1/4
C. 3/5
D. 7/10
Answer: A
Explanation: 0.75 is equivalent to 75/100, which simplifies to 3/4.
5. What is the result of 10 divided by 2.5?
A. 2.5
B. 4
C. 4.5
D. 5
Answer: B
Explanation: 10 divided by 2.5 equals 4 because 2.5 × 4 = 10.
6. Round 4.678 to two decimal places.
A. 4.60
B. 4.67
C. 4.68
D. 4.70
Answer: C
Explanation: The third decimal is 8, which is greater than or equal to 5, so round up the second decimal from 7 to 8, resulting in 4.68.
7. Which is greater: 0.45 or 0.5?
A. 0.45
B. 0.5
C. They are equal
D. Cannot be determined
Answer: B
Explanation: 0.5 is equal to 0.50, which is greater than 0.45.
8. What is 7.2 minus 3.8?
A. 2.4
B. 3.4
C. 3.5
D. 4.4
Answer: B
Explanation: Subtracting 3.8 from 7.2 gives 3.4 because 7.2 – 3.8 = 3.4.
9. Express 2.5 as a mixed number.
A. 2 1/2
B. 2 1/5
C. 5/2
D. 1/2
Answer: A
Explanation: 2.5 is the same as 2 and 0.5, and 0.5 is 1/2, so it is 2 1/2.
10. What is 0.1 multiplied by 0.1?
A. 0.001
B. 0.01
C. 0.1
D. 0.10
Answer: B
Explanation: 0.1 × 0.1 = 0.01.
11. Add 1.23 and 4.56.
A. 5.69
B. 5.79
C. 5.89
D. 5.99
Answer: B
Explanation: 1.23 + 4.56 = 5.79.
12. Which decimal represents 50%?
A. 0.05
B. 0.5
C. 0.50
D. 5.0
Answer: C
Explanation: 50% means 50 per 100, which is 0.50.
13. Divide 6.4 by 0.8.
A. 0.8
B. 8
C. 8.0
D. 80
Answer: C
Explanation: 6.4 ÷ 0.8 = 8.0.
14. What is the decimal form of 3/8?
A. 0.375
B. 0.38
C. 0.3750
D. 0.3
Answer: A
Explanation: 3 divided by 8 equals 0.375.
15. Subtract 2.10 from 5.00.
A. 2.80
B. 2.90
C. 2.99
D. 3.00
Answer: B
Explanation: 5.00 – 2.10 = 2.90.
16. Multiply 1.5 by 3.
A. 3.5
B. 4.0
C. 4.5
D. 5.0
Answer: C
Explanation: 1.5 × 3 = 4.5.
17. Compare 0.99 and 1.00; which is larger?
A. 0.99
B. 1.00
C. They are equal
D. Neither
Answer: B
Explanation: 1.00 is greater than 0.99.
18. Convert 0.25 to a percentage.
A. 0.25%
B. 25%
C. 2.5%
D. 250%
Answer: B
Explanation: 0.25 is equivalent to 25%.
19. What is 9.99 rounded to the nearest whole number?
A. 9
B. 10
C. 9.9
D. 10.0
Answer: B
Explanation: 9.99 is closer to 10 than to 9.
20. Add 0.05 and 0.95.
A. 0.90
B. 1.00
C. 1.10
D. 1.50
Answer: B
Explanation: 0.05 + 0.95 = 1.00.
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Part 3: Automatically generate quiz questions using OnlineExamMaker AI Question Generator
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