I will show you very easy formula for sum
Type your values
20
35
54
Select the value with one extra row and press "Alt+"
Multiply or product
Type value
20 20
Press “=” key, move cursor by using arrow keys on column and then Press “*” key and again move cursor to next column n press enter. See below video to how its work.
List of all major shortcut keys in Microsoft Excel 2007.
Ctrl+9 Hide rows.
CTRL+0 Hide columns.
CTRL+B Bold formatting.
CTRL+D Fill Down command to copy the content
CTRL+F Find and Replace
CTRL+I Italic formatting.
CTRL+N Creates a new
CTRL+O Open
CTRL+P Print
CTRL+S Save file
CTRL+U Underline
CTRL+PgUp Switches between worksheet left to right.
CTRL+PgDn Switches between worksheet right to right.
CTRL+SHIFT+( Unhides rows
CTRL+SHIFT+) Unhides columns
Ctrl + shift + Insert the column & row
F2 Edit cell
F7 Check spelling
F11 Creates a chart of selected data
F12 Display save as
See my video for more shortcuts