Teaching stats and using percentages now and again, it's not really that useful of a tool most of the time since you aren't usually working with an easy number like 50 (Or 10, 20, 25, etc.).
Usually what I'm doing is breaking it down into manageable parts (factors), so 6% is 5% + 1% which I can usually do in my head regardless of the number (or if 5% hard, work in increments of 1%, which I can multiply by 6).
It's a pretty common strategy to with with factors. Just surprised how many of my students don't know it!
