Ancient Hindu Problems
- 1 + 1 = 2 – in this solution each asterisk represents the digit 1
- 2 + 0 = 2 – in this solution one asterisk represents the digit 0 and the other asterisk represents the digit 2
- Some puzzles might have several solutions and some might have no solution
- Two adjacent asterisks represent a 2-digit number, like 74. Three adjacent asterisks represent a 3-digit number, and so on. In these cases the leftmost asterisk cannot represent the number 0, i.e. it is illegal to write to represent the number 8 as 08.
Maths Puzzles: Cryptarithms, Symbologies and Secret Codes

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