Problems from the 2012-13 School Year [Click the problem to enlarge.] Click the other Archive tabs for even more problems!

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Bull's Eye

Which ring did neither Don nor Erika hit?

How do you know?

Money Bags

Around the World

The Deca Tree

Sealed Solution

A set of ten cards, each showing one of the digits from 0 to 9, is divided up between five envelopes so that there are two cards in each envelope. The sum of the cards inside it is written on each envelope. What numbers could be inside the 8 envelope?

Same shapes have the same value. What number goes in each shape?

Toy Animals

Zac and Zoey found these boxes of toy animals at a yard sale. Help them find the value of each animal. How could you explain your thinking to a friend?