20 April 2018

1089

Choose a three-digit number so that the first and third digits differ two or more units:
  1. Write the number from right to left;
  2. Do the subtraction of the larger number by the smaller;
  3. Write the number obtained in point 2 from right to left and add it to the number also obtained in point 2.
And the result is \(1089\).

Example: Consider the number \(503\).
  1. \(305\)
  2. \(503-305=198\)
  3. \(198+981=1089\)

No comments:

Post a Comment