I'll be honest. We eat out more than occasionally. And, right now with the amount of traveling we've been doing, as well as having our house for sale, we've been eating out frequently. Earlier this spring, in an attempt to help my son master percentages, we placed him in charge of the tip. It only took a few meals before he was able to quickly calculate 15% of our tab. We told him his goal was to figure it out faster than any calculator. Plus, it has helped him to see the value of money as he has noticed how much we pay at one restaurant versus another versus buying the food and making it at home.