I have found this great interactive number line that is simple to use and has some great features. Click on http://www.standards.dfes.gov.uk/primary/teachingresources/mathematics/nns_itps/number_line/num_itp_numberLine1_6.swf
If you need help, click on the i button. As you move over the various symbols it will tell you what their function is. You can either show the numbers, or hide them. The numbers can be fixed or made to slide across the line. If the circle is blue, the number moves to the second position as soon as the second number is moved. If the circle is yellow the number is fixed. This sounds complicated, but play with it for a little while and you will soon get the hang of it. To work with numbers that are bigger or smaller than those shown (including negative numbers), click on the side arrows of the min and max buttons.
This really is a fantastic aid. have fun!
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