Stage:3 Challenge Level:
| * | * | 4 | |
| + | 2 | 8 | * |
| * | * | * | * |
This addition sum uses all ten digits 0, 1, 2 ... 9 exactly once. Find the sum and show that the one you give is the only possibility.
Place value. Working systematically. Algebra - generally. Addition & subtraction. Generalising. Visualising. Number - generally. Algorithms. Mathematical reasoning & proof. Creating expressions/formulae.
Published November 2001.
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