Counters problem
I have two counters and each have a number written on each side. When I place the two counters on a table I can add the numbers to make a total. If I can make totals of 15, 16, 17 and 18 what numbers can be on the counters. Full information, IWB files and answers. Adapted from Shell Centre's Problems with Patterns and Numbers.


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Created: Mar 14, 2013

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Creative Commons "Attribution

Creative Commons "Attribution