Conditional formatting help please

I need some help that could possibly save me a huge amount of time. I'm new to conditional formatting and am working on a new method to help my staff become more efficient . I'm editing a workbook that a colleague created at his old store.
Here's what I need:
any time someone types in 1, 2, 3, 4 and so on in any of cells H19:H30 I want the corresponding cell (in the screen shot you can see how 1 is N11, 5 is N12, 9 is N14 and 11 is N15) to turn yellow.
My colleague had to do conditional formatting for EVERY H cell for N values of 1-12. (see screen shot for an example)

There has to be an easier way to do this as I had to add an additional 80 lines and want to format it as easy as possible.
I was thinking maybe $H18:$H139=1 would work, but it doesn't
Please, can anyone help? Or do i have to do the same thing he did through row 130?
Thank you in advance.