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Playlist: 5th grade
How Many Ways: Divide to 5
Fill in the blanks so the division equals exactly 5, using each digit only once. Then change the 5 to a 6 and watch most of the solutions disappear.
Ultimate (or Inception) Tic Tac Toe
What if each square on a Tic-Tac-Toe board had another Tic-Tac-Toe board inside of it?
What’s In My Brain: Trapezoids or Not?
Which are trapezoids and which are not?