But lamb has a b on the end of it: l, a, m - b. Ha ha! Not that kind of bee – the letter b. If we pronounced it as lamb (pronounce the b) it would be easy to spell; but the b is silent which ...

The subject of a formula is the variable that is being worked out. It can be recognised as the letter on its own on one side of the equals sign. For example, in the formula for the area of a ...