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How can you cut a doughnut into 8 equal pieces with only three cuts of a knife?

Rectangle Tangle

The large rectangle is divided into a series of smaller quadrilaterals and triangles. Can you untangle what fractional part is represented by each of the shapes?

Dividing a Cake

Annie cut this numbered cake into 3 pieces with 3 cuts so that the numbers on each piece added to the same total. Where were the cuts and what fraction of the whole cake was each piece?

Linked Chains

Age 7 to 11 Challenge Level:
Why not try putting some of the chains together and see how far away from a -twenty-link chain you are?  Can you add one or more chains, or take one or more away, to make a twenty-link chain?

Could you replace any of your chains with two or three other small chains to make a new combination?