For our math game today we tried a challenge from @mathforlove Arrange the ten cards to make a pyramid so that each number is the difference of the two below it. My kids announced that it was impossible after 20 minutes. I worked on it for another 30ish minutes and solved it…or so I thought.
Who needs lunch when there is a puzzle to solve!?
Tiny Polka Dot Cards from MathforLove
Marvelous Pigs in Satin 
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