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Choose any three by three square of dates on a calendar page...

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Have You Got It?

Can you explain the strategy for winning this game with any target?

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Pair Sums

Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?

Pyramids

Age 11 to 14 Challenge Level:
This problem offers an opportunity of doing some simple arithmetic with positive and negative numbers, and a good context for introducing algebraic expressions.

Teachers may want to work through an example to ensure students understand the problem.

There is a similar interactive version in Number Pyramids