Yeah my brain just sees 5*6, and then I move the decimal. I never understood how people couldn't figure out tips when they wanted 20%.
If you live in the U.S. you do them quite often, multiply by 2. Want 10 multiply by .1... Half that and add it if you want 15. Whatever is easiest at that moment
You don't have to jump, you're already doing it. Some of us more than others... *Looks in mirror and hangs head