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Fraction Lengths

Can you find combinations of strips of paper which equal the length of the black strip? If the length of the black is 1, how could you write the sum of the strips?

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Linked Chains

Can you find ways to make twenty-link chains from these smaller chains?

Fractional Wall

Stage: 2 Challenge Level: Challenge Level:1
If the purple rod is the whole, what colour rod is one half?

What fraction of the purple rod are each of the other rods?

How many dark green rods, for example, are the same as one half?

If the purple rod is the whole, what colour rod is one third?