3 Act Math

Act 1

1. How much time is left?
2. Write down a guess.

Act 2

3. What information would be useful to figure this out?
4. Write down some questions you have in your head right now.
First Three Numbers

Here is the link to a handout with the image for students to measure.

Also, if paper isn’t ideal, here is the link to a Geogebra applet for students to work with.

Act 3


5. If a 55° central angle represented 24 seconds remaining, then what was the original timer set for?

Common Core Standards
Recognize and represent proportional relationships between quantities.
solve problems involving ratios, rates, and percents, including multi-step problems involving percent increase and percent decrease, and financial literacy problems


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