The grid command allows you to lay out equation objects in an automatically sized grid layout.
The gridc, gridl and gridr commands allow you to set the alignment of a grid by command.
grid(1&2&3\\4&5&6\\7&8&9)
The grid command is used in exactly the same way as the table command. The only difference is that tables are drawn with lines marking the individual cells. Visit the table command page for more details.