Maths

Maths Magic Trick | Maths | Algebra | Tutorial

This post will show you how you can turn a little bit of maths in to a magic trick that you can try with your friends or family.

Instructions

  1. Let your friends choose a number in their head between 1 and 10 (lower numbers for simplicity)
  2. Ask them to double it
  3. Ask them to add 4
  4. Tell them to Half it
  5. Ask them to subtract the original number
  6. Ask them if the answer is 2

The answer to this question will always be 2 regardless of the number your friends chose.

Solution

If we change the above into an algebra equation, we can see the maths behind how this trick works.

Let x be the unknown number that your friend has selected.

We will now apply all of the steps above to x:

  1. x
  2. 2x
  3. 2x + 4
  4. (2x + 4) / 2 = x + 2
  5. X + 2 – x
  6. 2

As you can see the main trick to this is the unknown number that your friend has selected, by asking them to minus the original number from the equation we are effectively removing the unknown from the equation.

See if you can create your own magic steps and lets us know in the comments below!

11 thoughts on “Maths Magic Trick | Maths | Algebra | Tutorial”

Leave a Reply to Simplified By Me Cancel reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.