Shortcut to change the opacity of the layer in photoshop

Shortcut to change the opacity of the layer in photoshop

If you have a layer active, other than the Background and a non-painting tool, such as the Move tool selected, change the opacity of that layer by pressing the first number of the percentage you want.

Example:
Press 3 for 30%, 9 for 90% etc, Or press two numbers very quickly, such as 3 then 5 for 35%. You do not have to click on the Opacity field first. Press 0 to get back to 100%.