Logical reasoning

This collection contains resources from the website 1001mathproblems.com by Sian Zelbo. The focus is on using logical reasoning in calculations, algebra and geometry.

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The mystery coin problem

This puzzle provides an introduction to simultaneous equations in three variables. Three combinations of coins are shown, together with the total value for each pair. The challenge is to calculate the value of each coin.

Playing with number cubes

This resource asks students to consider the properties of 'number cubes' - or dice. There are three questions to investigate, including rearranging the dots so that the difference between opposite sides is always constant. The extension ask students to consider different kinds of dice and an invitation to think of...

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