Always get the Number 2 Trick
Have a pen or pencil and paper ready, or if you have to use a calculator.
Find a volunteer.

Get the volunteer to think of any number.
Eg 5

Multiply that by 3.
5 x 3 = 15

Now add 6 to the amount.
15 + 6 = 21

Divide that by 3.
21 / 3 = 7

Subtract it from the first number used.
7 – 5 = 2