On your iPhone iPad or iPod touch tap the Insert button tap the Media button then tap Equation. This add-on for writing equations in WordPress works along with the WIRIS Plugin for Tiny MCE which can be downloaded via their official website. One of the WordPress drawbacks is lack of default support of math formulas.
Below is a screenshot of what is looks like after I typed in LaTex equations in editing box.
You can use Word Equations but will need to use MathType - Equation Editor to convert them to the format that WordPress Recognises. Write the structure of the document before starting to write section and subsections. You can select your equation and then the Mathtype Tab you can then select Convert Equation. Click on button and create you equation.