Stage: 2 Challenge Level: 
There are lots of answers to this problem, depending on what questions you choose to ask.
Have a go yourself, and if you discover anything interesting, e-mail us to tell us what you've done!
Have a go yourself, and if you discover anything interesting, e-mail us to tell us what you've done!
Generalising. Calculating with fractions. Factors and multiples. Multiplication & division. Fractions. Working systematically. Calculating with ratio & proportion. Addition & subtraction. Algebraic fractions. smartphone.
Published March 2002.
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