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# Number Lines and Solution Sets (F)

Number lines are a great aid to tricky calculations, particularly if they involve negative numbers. Traditionally, our number lines are horizontal, with negative numbers to the left of zero, and positive numbers to the right. You will also be familiar with vertical number lines, in thermometer scales and height/depth levels. Number lines are useful to help illustrate the solution to an inequality. See how well you can do in this GCSE Maths quiz!

If you have tried the Linear Inequalities quiz you will know that an inequality has a range of solutions. This can be displayed on a number line, with a circle drawn at the number that is the limit, and an arrow to indicate all numbers above or below the limit. Whether or not the circle is filled in or left open will depend on the nature of the inequality.

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Author:  Sally Thompson