A maths block typesets a formula written in LaTeX, the format scientists and engineers already use. For a formula inside a sentence, like E = mc^2, select the text and choose the formula button.
On its own line
The monthly payment on a loan of P at a monthly rate r over n months:
M = P \frac{r(1+r)^n}{(1+r)^n - 1}
The sum of the first n whole numbers:
\sum_{k=1}^{n} k = \frac{n(n+1)}{2}
Tip
Explain each symbol in the sentence before the formula. Readers who skip the maths still follow the page.