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When we go out to eat at a restaurant, it’s customary to tip as a percent of the bill. What this means, though, is that the tip doesn't depend on how hard the server works, but how expensive the menu is.

In this lesson students will use mental math to quickly estimate tips – 10%, 15% and 20% – at various restaurants. As they do, they’ll realize that the pricier the food, the larger the tip. Students discuss whether they think this is fair, and come up with alternative methods of tipping.

Students will

  • Use percents to calculate tips

Before you begin

Students do not necessarily need a firm grasp of percents. If you choose to teach percents through this lesson you may just need to pause and infuse direct instruction.

Common Core Standards

Content Standards
Mathematical Practices