Stage: 3 Challenge Level: 
In three years time Reza's age will be the square of his age of three years ago. How old is he?
Find similar relationships for differences other than $3$ years.
Properties of numbers. Trial and improvement. Creating expressions/formulae. Algebra - generally. Mathematical reasoning & proof. Generalising. Visualising. Addition & subtraction. Quadratic equations. Patterned numbers.
Published March 1999.
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