Always get the Number 3 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 12

Multiply the number by 2.
12 x 2 = 24

Add 9.
24 + 9 = 33

subtract 3.
33 – 3 = 30

Divide that number by 2.
30 / 2 = 15

Subtract that new number with the first number you used.
15 – 12 = 3
The answer will always be 3
Just like MAGIC 🙂