Copyright © University of Cambridge. All rights reserved.

'Mathematical Swimmer' printed from http://nrich.maths.org/

Show menu


Why do this problem?

This problem involves calculating with fractions and also uses knowledge of factors and multiples. It is a difficult problem that requires clear and logical thinking.

Key questions

How do you think you can start on this problem?
Would it help to make a list of some prime numbers?
Why not think of numbers which have many factors and try them?
Would it help to make a list of numbers which have many factors?
Why not start with $12$? What are its factors?
Are all the numbers up to $12$ either a prime number or a fraction that will simplify?
Now do you think you can try with larger numbers?

Possible extension

Learners could on to Peaches Today, Peaches Tomorrow.

Possible support

If learners are finding coping with fractions are very difficult suggest trying this Stage 2 problem, Fractions Made Faster or even Fractional Wall.