8th Grade Coprime Numbers Quizzes , Questions & Answers

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Identifying and Applying Coprime Numbers

Did you know two numbers don’t have to be prime to be coprime? In this quiz, you’ll explore pairs of numbers that share no factors except 1, test real examples, and connect the idea of coprimes to GCD. Take this quiz...

Questions: 20 | Attempts: 35 | Last updated: Jan 20, 2026

Sample Question 1
Which of the following pairs is coprime?

(8, 12)

(15, 25)

(14, 28)

(14, 25)

Sample Question 2
Which pair is not coprime?

(13, 20)

(16, 24)

(9, 22)

(17, 30)

Sample Question 3
If GCD(21, x) = 1, which x value makes them coprime?

10

14

21

28

8th Grade Coprime Numbers Quizzes , Questions & Answers

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