Guess the number magic trick

Calculators are still a great source of amusement for children.  This simple magic trick will have everyone amused for hours.

What you need:

• A calculator

Number of players:
1+

Activity:

Get a friend to enter any number (up to seven digits) on the calculator. They should also write the number down somewhere hidden in case they forget it.

Then ask them to use the calculator to perform the following arithmetic with that number:

Multiply by 3.

Add 2.

Multiply again by 3.

Add the number which is two greater than the first number.

Ask your friend to write the answer on a piece of paper and show it to you. 

Leave out the last digit of the number and that will be the number your friend first put in.