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The last time I effectively taught adding & subtracting with negative numbers I was on to a good idea, but there were a couple of faults - only the kids actually walking the number line were engaged, and they lost their positional cues as soon as they...
The way the author writes is very friendly and frank. The post on grading the maths marks is a very thought-provoking one. It reflects the amount of effort the author have put into thinking out the best option to make maths learning meaningful.
A good read-up for anyone interested in maths and its teaching.
