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Come up with any three numbers in sequence; for example, 123, or 345, or 456, etc.
Reverse the numbers that you chose and subtract the smaller number from the larger number.

The result will always be 198. For example, 123 would become 321; subtract 123 from 321, and the answer is 198.

Try it and see for yourself.

This entry is located in the following unit: Number Challenges (page 1)
A unit related to: “for example
(there are certain anatomic terms which present various situations; for example, a body part may be horizontal, as opposed to vertical; in front as opposed to being behind or at the back; above as opposed to being under, etc.)