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'Fractional Wall' printed from http://nrich.maths.org/
This visual representation of fractions is very powerful. The main aim of the problem is for children to find equivalent fractions using the image, but then to deduce a "rule" (or more than one) for finding equivalent fractions without a picture. Cuisenaire rods could be used as a starter activity, perhaps using one of length 6 as the whole or you could use the Cuisenaire Environment
Once children have completed this activity, they might like to have a go at Fractions Made Faster