# Telephone Number Predictor Magic Trick

• 01 of 04

### Setting Up the Trick

Here's one of those mathematical oddities that somewhat masquerades as a magic trick. Your spectator, with a calculator in hand, performs a series of calculations. And surprise, at the end, he or she is looking at their telephone number.

Ask your spectators to grab their calculators and enter the first three digits of their telephone numbers. Be sure that they enter the first three digits of their actual phone number, not the area code. As an example, we'll use the fictional phone number of 555-1212.

Enter 555

Continue to 2 of 4 below.
• 02 of 04

Ask them to multiply by 80.

555 x 80 = 44400

44400 + 1 = 44401

Continue to 3 of 4 below.
• 03 of 04

Ask them to multiply by 250.

44401 x 250 = 11100250

Ask them to add the last four digits of their telephone number. And then add the same number again.

11100250 + 1212 = 11101462

11101462 + 1212 = 11102674

Continue to 4 of 4 below.
• 04 of 04

### Subtract and Divide

11102674 - 250 = 11102424

Ask them to divide by 2. If they've done everything correctly, they'll be looking at their telephone number!

45113 / 2 = 5551212

Here are the steps again:

Enter the first three digits of their phone number
Multiply by 80