How to describe maximum terms in a simple math application

I'm working on a simple math app that lets you do addition, subtraction, multiplication and division. I allow the user to select which operators they want to use and configure the maximum range. I'm trying to figure out the clearest and simplest way to let the user configure the maximum.

I have two examples of what I Have tried below:

(I changed the value for subtraction to be the maximum minuend, but this picture is a bit out of date.) I imagine people could find this confusing if they don't know what the term is.

I also tried this: Which I like, but I'm not convinced that it's clear. I've thought of improving by making all non-bold text a grey color to really emphasize the number being configured. For add/sub/mult I'm not sure if I should only bold one number or if that would just be confusing. Another idea is to use formula text like so: 10 + _ = ? or ? / 10 = ?

Any ideas on if either of these ways is clearer? Or if there's something different I haven't thought of?