Stage: 3 Challenge Level: 
Each symbol has a numerical value. The total for the symbols is written at the end of each row and column. Can you find the missing total that should go where the question mark has been put?
Generalising. Properties of numbers. Mathematical reasoning & proof. Using symbols. Divisibility. Multiplication & division. Factors and multiples. Addition & subtraction. Working systematically. Trial and improvement.
Published April 2001.
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