Act I: I smudged out these tip suggestions. What should they be? Consider having students make a fast 5 -second prediction in their heads.
Act II: Students work – few minutes on own, then with partners. Class shares how you figured these out.
Act III: Here’s the un-smudged receipt. How did they figure the tip … before or after the tax? Why does it matter?
Sequel: If kids finish early, ask them to find other tip amounts for this bill, such as 10%, 25% or other. Or if a customer didn’t want to think and just left a ten dollar bill, what percent is that?
CCSS: 6.RP.3, 7.RP.3
For members we have teaching suggestions: SuggestedTips.pdf
from Yummy Math http://www.yummymath.com/2016/how-did-they-figure-these-tips/