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Can You Solve the Sorting Hat Riddle Dan Katz and Alex Rosenthal
It’s your first day at Magnificent Marigold’s Magical Macademy. But before you can learn your first spell you must get through the sorting ceremony. And the sorting hat has chosen you for a special challenge. The Macademy had 8 founders who established four houses, and there was once a mysterious fifth house. Can you figure out who founded what? Dan Katz and Alex Rosenthal show how.

Which Customary Unit Of Volume Is Appropriate?
Improve your math knowledge with free questions in "Which customary unit of volume is appropriate?" and thousands of other math skills.

Unit Prices
Improve your math knowledge with free questions in "Unit prices" and thousands of other math skills.

Use Models To Subtract From Three-digit Numbers - Without Regrouping
Improve your math knowledge with free questions in "Use models to subtract from three-digit numbers - without regrouping" and thousands of other math skills.

Multiply Mixed Numbers: Word Problems
Improve your math knowledge with free questions in "Multiply mixed numbers: word problems" and thousands of other math skills.

Volume Of Cubes And Rectangular Prisms With Decimal Side Lengths
Improve your math knowledge with free questions in "Volume of cubes and rectangular prisms with decimal side lengths" and thousands of other math skills.

TED-Ed: Can You Solve This Riddle?
TED-Ed celebrates the ideas of teachers and students around the world. Discover hundreds of animated lessons, create customized lessons, and share your big ideas.

Complete A Table For A Two-variable Relationship
Improve your math knowledge with free questions in "Complete a table for a two-variable relationship" and thousands of other math skills.

Understanding Powers Of Ten
Improve your math knowledge with free questions in "Understanding powers of ten" and thousands of other math skills.

The Mighty Mathematics of the Lever Andy Peterson and Zack Patterson
Archimedes once said “Give me a place to stand, and I shall move the Earth.” While the idea of a person moving such a huge mass on their own might sound impossible, chances are you’ve seen this idea in action at your local playground. Andy Peterson and Zack Patterson use the seesaw to illustrate the amazing implications and uses of the lever.

Choose Numbers With A Particular Difference
Improve your math knowledge with free questions in "Choose numbers with a particular difference" and thousands of other math skills.

Addition And Subtraction Terms
Improve your math knowledge with free questions in "Addition and subtraction terms" and thousands of other math skills.


PhET: Expression Exchange
Build coin expressions, then exchange them for variable expressions. Simplify and evaluate expressions until you are ready to test your understanding of equivalent expressions in the game!

Complete Addition And Subtraction Sentences With Fractions
Improve your math knowledge with free questions in "Complete addition and subtraction sentences with fractions" and thousands of other math skills.