# Numbering equations

From Apache OpenOffice Wiki

This chapter has been replaced by the Math Guide.

Equation numbering is one of OOo Math's best hidden features. The steps are simple, but obscure:

- Start a new line.
- Type “fn" and then press
*F3*.

The “fn" is replaced by a numbered formula:

- (2)

Now you can double-click on the formula to edit it. For example, here is the Riemann Zeta function:

- (3)

You can reference an equation (“as shown in Equation (2)") with these steps:

- Choose
**Insert > Cross-reference**from the menu bar. - On the
*Cross-references*tab, under*Type*, select*Text*. - Under
*Selection*, select the equation number. - Under
*Format*, select*Reference*. - Click
**Insert**.

Done! If you later add more equations to the paper before the referenced equation, all the equations will automatically renumber and the cross-references will update.