How to type a minus sign
When you’re writing a report or an email you probably use a hyphen (the key to the right of the zero) when you want a minus sign. It’s OK, but a hyphen is too short because it’s intended to be a connector in words like co-ordination. A minus sign looks better if you use an en-dash (–), which is a dash that is the same width as an “n”. See for yourself: