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?

a d v e r t i s e m e n t

a d v e r t i s e m e n t

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

    • 20
    • 80
    • 10
  • All right! and the gcd of 33, 77 and 121?

    • 11
    • 12
    • 20
  • No need to make many counts, what is the gcd of 21 and 28?

    • 7
    • 6
    • 5
  • How you doing? Now the gcd of 15 and 30

    • 30
    • 15
    • 5
  • Now! gcd of 30, 42 and 54

    • 6
    • 30
    • 8
  • What is the gcd of 20 and 16?

    • 2
    • 4
    • 8
  • 18 and 24?

    • 6
    • 18
    • 24
  • This one surely will be too easy for you: gcd of 3, 6, 9

    • 9
    • 6
    • 3
  • What if we make it a little harder? 32, 48, 64 and 80

    • 20
    • 16
    • 14
  • What is the gcd of 15, 20, 30 and 60?

    • 5
    • 10
    • 15
  • 16, 24 and 40 have as gcd:

    • 8
    • 2
    • 4
  • gcd of 7, 14 and 21

    • 21
    • 14
    • 7
  • gcd of 20, 28, 36 and 40

    • 2
    • 4
    • 8
  • gcd of 144 and 520.

    • 2
    • 4
    • 8
  • Last! What is the gcd of 28, 42, 56 and 70?

    • 14
    • 16
    • 12

a d v e r t i s e m e n t

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