How did they figure these tips?

receipt-smudged

Clicking on this image will show it larger in a new window.

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/

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