Monthly Archives: June 2019

Adding and subtracting directed numbers

Download the PowerPoint here. OK. So this is a big one. Firstly, I have found teaching negatives difficult in the past. Teaching the rules is a bit useless. ‘Two negatives make a positive’ often leads students to doing things like -5 – 9 = 4 (or similar). I avoid the rules like the plague. I… Read More »