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Tagib - Think like a mathematician!

To work with us, answer one qualifying question and enter your email address.

  1. Take any four-digit number, using at least two different digits. (Leading zeros are allowed.)
  2. Arrange the digits in descending and then in ascending order to get two four-digit numbers, adding leading zeros if necessary.
  3. Subtract the smaller number from the bigger number.
  4. If you get the same number that you used in step 2, then enter it below as your answer. Otherwise, go back to step 2 with the number you got in step 3.