Finding the GCD of Small Numbers

  • 6th Grade
Reviewed by Cierra Henderson
Cierra Henderson, MBA |
K-12 Expert
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Cierra is an educational consultant and curriculum developer who has worked with students in K-12 for a variety of subjects including English and Math as well as test prep. She specializes in one-on-one support for students especially those with learning differences. She holds an MBA from the University of Massachusetts Amherst and a certificate in educational consulting from UC Irvine.
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| Attempts: 32 | Questions: 10 | Updated: Jan 20, 2026
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1) Which is the GCD of 25 and 40?

Explanation

Factors of 25: {1, 5, 25}. Factors of 40: {1, 2, 4, 5, 8, 10, 20, 40}. The greatest common factor is 10.

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About This Quiz
Finding The GCD Of Small Numbers - Quiz

Ready to dive into the world of common factors? In this quiz, you’ll practice finding the greatest common divisor (GCD) of pairs of numbers. From simple fact checks to quick mental math, you’ll see how the GCD helps organize numbers into neat patterns. Take this quiz to sharpen your numbe... see moresense and master the basics.
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2) What is the GCD of 14 and 49?

Explanation

Factors of 14: {1, 2, 7, 14}. Factors of 49: {1, 7, 49}. The greatest common factor is 7.

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3) Which is the GCD of 22 and 55?

Explanation

Factors of 22: {1, 2, 11, 22}. Factors of 55: {1, 5, 11, 55}. The greatest common factor is 11.

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4) What is the GCD of 12 and 18?

Explanation

12 = 2 × 2 × 3

18 = 2 × 3 × 3

Common factors: 2 × 3 = 6

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5) What is the GCD of 20 and 30?

Explanation

Factors of 20: {1, 2, 4, 5, 10, 20}. Factors of 30: {1, 2, 3, 5, 6, 10, 15, 30}. The greatest common factor is 10.

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6) The GCD of 16 and 24 is:

Explanation

Factors of 16: {1, 2, 4, 8, 16}. Factors of 24: {1, 2, 3, 4, 6, 8, 12, 24}. The greatest common factor is 8.

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7) Which is the GCD of 32 and 48?

Explanation

Factors of 32: {1, 2, 4, 8, 16, 32}. Factors of 48: {1, 2, 3, 4, 6, 8, 12, 16, 24, 48}. The greatest common factor is 16.

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8) Find the GCD of 9 and 27.

Explanation

Factors of 9: {1, 3, 9}. Factors of 27: {1, 3, 9, 27}. The greatest common factor is 9.

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9) The GCD of 8 and 15 is:

Explanation

Factors of 8: {1, 2, 4, 8}. Factors of 15: {1, 3, 5, 15}. Only 1 is common.

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10) What is the GCD of 36 and 54?

Explanation

Factors of 36: {1, 2, 3, 4, 6, 9, 12, 18, 36}. Factors of 54: {1, 2, 3, 6, 9, 18, 27, 54}. The greatest common factor is 18.

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Cierra Henderson |MBA |
K-12 Expert
Cierra is an educational consultant and curriculum developer who has worked with students in K-12 for a variety of subjects including English and Math as well as test prep. She specializes in one-on-one support for students especially those with learning differences. She holds an MBA from the University of Massachusetts Amherst and a certificate in educational consulting from UC Irvine.
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Which is the GCD of 25 and 40?
What is the GCD of 14 and 49?
Which is the GCD of 22 and 55?
What is the GCD of 12 and 18?
What is the GCD of 20 and 30?
The GCD of 16 and 24 is:
Which is the GCD of 32 and 48?
Find the GCD of 9 and 27.
The GCD of 8 and 15 is:
What is the GCD of 36 and 54?
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