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Problem solving is the heart of mathematical learning. This site complements existing curricula by providing a resource for teachers who use, or are only beginning to use, a problem-centered approach. This resource will also help parents and tutors support problem-based learning in out-of-school settings.

Teachthought describes this as "While the site is simple a crudely interactive graphic with links to videos, it has, in one fell swoop, creatively curated some of the most compelling and engaging "problems" in mathematics. From Benford's Law to French Numbers, to whether or not zero is an even number, it frames the content area of math-which is often riddled with rote practice of very traditional arithmetic and formulas-in a problem-based learning kind of approach. Fantastic resource for bell ringers, test questions, math project-based learning ideas, or as a model for students to curate their own curiosities about the incredible-and poorly marketed-world of mathematics."

Fairly thorough description without being too wordy.

Recommended by Sir Ken Robinson himself.  Gives several concrete examples of problem-based units and ways to organize

Great collection of articles on PBL from Edutopia

This site provides an extensive collection of free resources, math games, and handson math activities aligned with the Common Core State Standards for Mathematics. Our math printables are suitable for use in math centers, small group or whole class settings. Instructions for each activity are presented in large print on a task card in child-friendly language to enable students to work on tasks independently after a brief introduction to the task. All materials and activities on the site are designed to support the Common Core State Standards and are based on the belief that effective mathematical learning is best achieved when students are given frequent opportunities to develop their own problem solving strategies, to pose questions, and to engage in mathematical inquiry through the use of open-ended tasks.