## Social Question

# Is this a good math trick?

Asked by LostInParadise (27688)
February 3rd, 2018

Write a 9 digit number such that the seventh and ninth digits (1’s and 100’s columns) are 1 and 9 in either order.

Form a second 9 digit number by transposing the first and third digits, fourth and sixth digits, and seventh and ninth digits.

Using a calculator, subtract the smaller number from the larger one. The number showing will be exactly divisible by 792, which can be verified by doing the division and ending up with a whole number.

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