Mathagogy: adding and subtracting negative numbers

Adding and subtracting negative numbers - a vital topic. Yet even my sixth formers make mistakes using them, for example in differentiating reciprocals, or solving simultaneous equations. Much of this comes down to the classic 'two minuses make a plus' memory aid - a classic case of over-generalization - yet what can replace it? As Rob Brown tweeted,…

Adding and subtracting negative numbers

mathagogy Reflections on maths pedagogy, education, and teaching

Adding and Subtracting Negative Numbers

I use this as times tests. There is 1 addition sheet and 1 subtraction sheet. We have a school wide times test program but I often have kids that

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Mathagogy: adding and subtracting negative numbers

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