November 2018
Problem of the Month
Four Digit Number Trick
Take any four numbers (single digits) and add them together.
Arrange the original four digits in any order to form a four digit number.
Subtract the sum from this four-digit number, and you should get another four digit number.
Hide any one of the four digits in this new number (except a zero) and reveal the other three digits.
How can you determine the value of the hidden number?