We need to stop saying the area of rectangles is 'length × width'. There are so many ways we Maths teachers have made life difficult for ourselves by muddling up the language. Yes, we're trying our best to wean ourselves off saying 'minus', and specifying more clearly whether we're talking about subtraction or negative values. But we can do better than that. (And let's face it, the word 'division' isn't always exactly helpful either - are we talking about grouping or sharing?) The area of rectangles is another example. We say 'length × width' for the very first area formula we teach, and then change the words we use for all the others just as they're getting their heads around the concept. And to start with, 'length' tends to imply 'the longer side', meaning 'width' must be 'the shorter side', but then width turns into 'the distance across from left to right' for all the other shapes that follow...
Maths Resources, Explanations and Puzzles, for KS3, KS4 (GCSE) and UKMT Challenges