Numbers provides predesigned table styles for each template. After adding a table, you can customize it however you like. You can add as many tables as you want to a sheet.
Click Table 
in the toolbar, then select a table layout.
Click the left and right arrows to see more style options.
To type in a cell, click the cell, then enter your content.
To change the appearance of the table or its cells, use the tools in the Table, Cell, Text, or Arrange panes of the Format inspector.
When you add a table, it has a placeholder name (such as Table 1), which you can change or hide. Each table on a sheet must have a unique name.
Do any of the following:
Change the table name: Triple-click the name, then type a new one.
Show or hide the table name: In the Table pane of the Format inspector, select or deselect the Table Name checkbox (below Headers & Footer).
You can also show or hide the table name without opening the Format inspector. Click the table, Control-click the numbered bar to the left of row 1, then choose Show Table Name or Hide Table Name.
Click the table, click 
in the top-left corner of the table, then press Delete.
Note: If a table is linked to a form added in Numbers for iOS, deleting the table clears the form.