Pi Day Pizza Problem Bell Ringer
A six-minute March 14 math warm-up: use pi to find the circumference and area of a 14-inch pizza. Show your work, then eat the evidence.
- Best time
- March
- Format
- Timed warm-ups students start the moment class begins
- Cost
- Free — no student accounts
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Pi Day Pizza Problem Bell Ringer
A six-minute March 14 math warm-up: use pi to find the circumference and area of a 14-inch pizza. Show your work, then eat the evidence.
What's inside this bell ringer
A round pizza has a diameter of 14 inches. Using pi ≈ 3.14: (1) Find the circumference. (2) Find the area. Show your work. Bonus: A 10-inch pizza costs $8 and the 14-inch costs $14 — which is the better deal per square inch?
Teacher tips
The bonus question is where the real thinking lives — big pizzas are almost always the better deal, which surprises students.
Answers: circumference ≈ 43.96 in; area ≈ 153.86 sq in.
Frequently asked questions
How do I use this activity with my class?
Every teacher runs their own copy. Click "Copy & make it yours" and this template is added to your free DailyEd account — you can edit every question, prompt, and setting, then share YOUR link with students. Their responses go only to you.
Is this activity free?
Yes. This template and everything in the DailyEd activity library is free for teachers.
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