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PBS
Pbs: Mike and Padhu: Bikes and Trikes
Solve a word problem with Mike and Padhu. This video focuses on valid methods of problem solving, including guess-and-check and modeling with manipulatives.
University of Cambridge
University of Cambridge: Nrich: Spelling Circle
On this one page website use trial and error to find the words hidden in the spelling circles. Check your solution right at the website.