Challenge Archives

Click the links to watch the challenge and response videos, and to explore follow-up challenges!

Spoiler Alert! Video responses include explanations of how to solve the challenge problem. We recommend that you resist the temptation to watch response videos until after you have explored the challenge individually or with a problem solving team!
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Challenge 01: Ermer Numbers

Challenge 09: Awe of Large Numbers

Challenge 02: Multiply and Flip

Challenge 10: Pandigital Puzzles

Challenge 03: Finger Counting

Challenge 11: The Problem With Pirates

Challenge 04: Two-key Calculator

Challenge 12: Parenthesizations

Challenge 05: International Paper

Challenge 13: Numerical Recycling

Challenge 06: Pieces of Eight

Challenge 14: Tick, Tick, Tick...

Challenge 07: String Theory

Challenge 08: The Confetti Problem

Challenge 15: Pizza Party!

Challenge 16: Palindrome Multiples