Last updated
3 February 2015
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An easy way to try to explain to students why 'minus minus' actually means 'plus'. With thanks for the idea to Craig Barton.
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Just what I was looking for - thank you!
Empty reply does not make any sense for the end user
Love it. Thank you :)
Empty reply does not make any sense for the end user
Simple explanation of a tricky area- thanks
Empty reply does not make any sense for the end user
Empty reply does not make any sense for the end user
Empty reply does not make any sense for the end user
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