Stage: 1 Challenge Level: 
Fill in the numbers to make the sum of each row, column and diagonal equal to 15.
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| Use 2, 5, 7, 9 | Use 1, 2, 6, 7, 9 |
Factors and multiples. Trial and improvement. Investigations. Comparing and Ordering numbers. Multiplication & division. Working systematically. Generalising. Combinations. Interactivities. Addition & subtraction.
Published November 1999.
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