Did you know Photoshop can do math inside text fields? This means that, for example, if you want to change the Opacity to 48% divided by 3, you don’t have to do the math. You’d type 48/3 into the Opacity field, and when you press Enter, you end up with 16. You can add, subtract, divide, and multiply (use the * symbol for multiplication). You can also do compound math, such as 20*2+5–2, which would give 43. These work in every field that accepts numbers in Photoshop. If you’re in a dialog with multiple fields, press Tab to move to the next field. Now that’s handy. 

This tip previously published in Colin Smith’s Photoshop Tips column, in the March, 2020 issue of Photoshop User magazine.