Raw material: Excel

1, click Excel, as shown in the figure below.

2. Enter the Excel table and find the sum of the number of columns, as shown in the figure below.

3. Hold down Ctrl and select all data, as shown in the figure below.

4. Then find Sum and click Sum, as shown in the figure below.

5. After clicking Sum, you will see an extra number, which is the sum of all the numbers above, as shown in the figure below.