Do you like to speed up your neurons? Do these quick counts without resorting to pencil and paper

Do you like to speed up your neurons?

Do you like to speed up your neurons? Don’t cheat! Do you remember how to calculate the Greatest Common Divisor? It’ll be useful in this quiz. 40% of people need to use pencil and paper, do you belong to that gruop?

Do you like to speed up your neurons? Do these quick counts without resorting to pencil and paper


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  • Question of

    Let’s start! Find the gcd of 20 and 80:

    • 20
    • 80
    • 10
  • Question of

    All right! and the gcd of 33, 77 and 121?

    • 11
    • 12
    • 20
  • Question of

    No need to make many counts, what is the gcd of 21 and 28?

    • 7
    • 6
    • 5
  • Question of

    How you doing? Now the gcd of 15 and 30

    • 30
    • 15
    • 5
  • Question of

    Now! gcd of 30, 42 and 54

    • 6
    • 30
    • 8
  • Question of

    What is the gcd of 20 and 16?

    • 2
    • 4
    • 8
  • Question of

    18 and 24?

    • 6
    • 18
    • 24
  • Question of

    This one surely will be too easy for you: gcd of 3, 6, 9

    • 9
    • 6
    • 3
  • Question of

    What if we make it a little harder? 32, 48, 64 and 80

    • 20
    • 16
    • 14
  • Question of

    What is the gcd of 15, 20, 30 and 60?

    • 5
    • 10
    • 15
  • Question of

    16, 24 and 40 have as gcd:

    • 8
    • 2
    • 4
  • Question of

    gcd of 7, 14 and 21

    • 21
    • 14
    • 7
  • Question of

    gcd of 20, 28, 36 and 40

    • 2
    • 4
    • 8
  • Question of

    gcd of 144 and 520.

    • 2
    • 4
    • 8
  • Question of

    Last! What is the gcd of 28, 42, 56 and 70?

    • 14
    • 16
    • 12

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Tamara Dominas

Written by Tamara Dominas

My name is Tamara. I define myself as a bookworm and that's where I spend most of my time. I'm a chemist, with a developing passion for languages. I speak three languages and I'm already going for the fourth. I currently live in Rome, Italy, and I declare myself profoundly in love with this city. You can write to me: send me an email

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