Positive and negative numbers

problem

Minus One Two Three

Age

14 to 16

Challenge level

2 out of 3

Substitute -1, -2 or -3, into an algebraic expression and you'll get three results. Is it possible to tell in advance which of those three will be the largest ?
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Negative Numbers

A brief history of negative numbers throughout the ages
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Making Sense of Positives and Negatives

This article suggests some ways of making sense of calculations involving positive and negative numbers.
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Positive About Negative Numbers

In this article for teachers, Liz Woodham describes resources on NRICH that can help primary-aged children get to grips with negative numbers.
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Adding and Subtracting Positive and Negative Numbers

How can we help students make sense of addition and subtraction of negative numbers?
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The History of Negative Numbers

This article -useful for teachers and learners - gives a short account of the history of negative numbers.