These are exactly the kinds of mistakes that I make– I just don’t notice that little negative dash all that well. It helps me to purposefully notice (or even circle) all the negative signs before starting, so I don’t forget about them. You could ask them to circle the negative signs before doing the work…it might either fix the problem or show you what they’re ignoring.
One reply on “Arithmetic with negative numbers”
These are exactly the kinds of mistakes that I make– I just don’t notice that little negative dash all that well. It helps me to purposefully notice (or even circle) all the negative signs before starting, so I don’t forget about them. You could ask them to circle the negative signs before doing the work…it might either fix the problem or show you what they’re ignoring.