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Choose any three by three square of dates on a calendar page... Make a set of numbers that use all the digits from 1 to 9, once and once only. Add them up. The result is divisible by 9. Add each of the digits in the new number. What is their sum? Now try some other possibilities for yourself!

# Cryptarithms

##### Age 11 to 14 Challenge Level:

A cryptarithm is a mathematical puzzle where the digits in a sum have been replaced by letters.

In each of the puzzles below, each letter stands for a different digit.

Bearing in mind that none of the numbers below have 0 as a leading digit, can you find a solution to all of these cryptharithms?

Do any of them have more than one solution?

 1 2 3 4. 5 6 7 8. 9 10 11 12. 13 14 15 16. 17 18 19 20. 21 22 23 Here is a link to a printable worksheet of this problem.

Final Challenge

Is it possible for all of the digits 1 to 9 to appear exactly once in the addition below?

# # #
+ # # #
# # #

Using each digit from 1 to 9 once, what is the largest sum you can obtain in the addition above?

If you enjoyed this problem, you may also like to take a look at Two and Two.

With thanks to Don Steward, whose ideas formed the basis of this problem.