Guess your telephone number math game

Guess Your Telephone Number Math Game

This math game ONLY works with the format of US Telephone Numbers!

In order to play this math game, you need to:

✅ Use a calculator that can display numbers as large as 99,999,999,999.

✅ If you are using your Smartphone calculator, turn your device to LANDSCAPE MODE so that it can display the large numbers.

Think of a Telephone Number and remember the area code, first 3 numbers and last 4 numbers!

Complete the arithmetic steps shown below.


Step 1
✅ Multiply the 3 DIGIT AREA CODE of your telephone number by 40.
Step 2
✅ Multiply the results by 25.
Step 3
✅ Add the FIRST 3 DIGITS of your telephone number.
Step 4
✅ Multiply the results by 50.
Step 5
✅ Add 1 to the results.
Step 6
✅ Multiply the results by 400.
Step 7
✅ Add the LAST 4 DIGITS of your telephone number.
Step 8
✅ Add the LAST 4 DIGITS of your telephone number AGAIN.
Step 9
✅ Divide the results by 2.
Step 10
✅ Subtract 200 from the results.


👍 If you completed all of the arithmetic steps correctly, your calculator is showing your telephone number!