Choose Insert Equation and choose the equation you want from the gallery. However you can insert the math equation and symbol by hand but it looks more professional using the Word built-in feature. This OMath object has properties and methods.
On the Table Tools Layout tab click the Formula button.
Click the icon to insert an. Youll see this on the far right in the Symbols group. Uncheck the box next to the MathType Commands item. Use the DocumentOMathsAdd method to create a new equation.