Number and Numeration Practice Questions

WAEC (West Africa) · WAEC Mathematics · 130 free MCQs with instant results and detailed explanations.

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Sample Questions from Number and Numeration

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Easy

What is the place value of the digit '5' in the number 452,367?

A. 5

B. 50

C. 5000

D. 50000

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Correct Answer: C

The place value of '5' in 452,367 is 5000 since it is in the thousands place.

Easy

Which of the following is the correct representation of the number 3,200?

A. Three thousand two hundred

B. Thirty-two hundred

C. Three hundred twenty

D. Three thousand twenty

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Correct Answer: A

The correct representation of 3,200 is 'Three thousand two hundred'.

Easy

If a number is increased by 25%, what is the factor by which it is multiplied?

A. 1.25

B. 0.25

C. 1.5

D. 0.75

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Correct Answer: A

Increasing a number by 25% means multiplying it by 1.25 (which is 100% + 25%).

Medium

What is the value of 5^3 + 3^2?

A. 134

B. 125

C. 35

D. 28

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Correct Answer: A

5^3 calculates to 125 and 3^2 to 9. Adding them gives 125 + 9 = 134.

Medium

If a number is divided by 6, the remainder is 4. What could the number be?

A. 16

B. 22

C. 10

D. 28

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Correct Answer: B

The number can be expressed in the form 6k + 4. For k=3, the number is 22, which gives a remainder of 4 when divided by 6.

Medium

Find the least common multiple (LCM) of 12 and 18.

A. 36

B. 24

C. 54

D. 30

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Correct Answer: A

The LCM of 12 and 18 is calculated as follows: 12 = 2^2 * 3, 18 = 2 * 3^2. Thus, LCM = 2^2 * 3^2 = 36.

Medium

An integer is multiplied by 9 and 27 is added to the result. If the final answer is 90, what is the integer?

A. 7

B. 8

C. 9

D. 10

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Correct Answer: B

Let the integer be x. The equation is 9x + 27 = 90. Solving gives x = 8.

Hard

If the ratio of three numbers is 2:3:5 and their sum is 100, what is the largest number?

A. 20

B. 30

C. 50

D. 40

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Correct Answer: C

To find the largest number, first, calculate the total parts: 2 + 3 + 5 = 10. Each part is 100/10 = 10. The largest number corresponds to the 5 parts, which is 5 * 10 = 50.

Hard

What is the least common multiple (LCM) of 12, 15, and 20?

A. 60

B. 120

C. 180

D. 240

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Correct Answer: A

The LCM of 12, 15, and 20 is 60, as it is the smallest number that all three can divide without leaving a remainder.

Q10

Hard

If a certain number is divided by 6, the remainder is 4. What will be the remainder when the same number is divided by 3?

A. 1

B. 2

C. 0

D. 4

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Correct Answer: B

When a number leaves a remainder of 4 when divided by 6, it can be expressed as 6k + 4 for some integer k. When 6k + 4 is divided by 3, it simplifies to 0k + 1 (since 6k is divisible by 3), hence the remainder is 1.

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Number and Numeration — WAEC (West Africa) WAEC Mathematics Practice Questions Online

This page contains 130 practice MCQs for the chapter Number and Numeration in WAEC (West Africa) WAEC Mathematics. The questions are organized by difficulty — 42 easy, 67 medium, 21 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.