You may also like

problem icon

Calendar Capers

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

problem icon

Have You Got It?

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

problem icon

Pair Sums

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


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