Scholastic
Scholastic: Math Maven's Mysteries
Scholastic.com offers information on how to use the Math Maven's Mysteries to enhance problem-solving skills, partly through class discussion. For the actual mysteries, click on Math Maven Home.
University of Cambridge
University of Cambridge: Nrich: Tom's Number
Use the clues Tom gives you to figure out his number. The solution is right there on this one page website.
University of Cambridge
University of Cambridge: Nrich: Calendar Calculations
Follow the directions and use your problem solving skills on this one page website to help you find the solution. Solutions are available right on the NRich website.