National Council of Teachers of Mathematics
Nctm: Figure This: What's Missing?
Can you find the missing pattern in the "sona?" Explore missing patterns and growing patterns in this NCTM Math Challenges for Families activity. Discover how archaeologist and anthropologist use these mathematical patterns to learn...
University of Cambridge
University of Cambridge: Nrich: Doplication
On this one page website sharpen your logic and pattern extension skills while working on this challenge. The solution is available to double check your solution.