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Challenge 5: Upside Down? Figure This!
Upside Down? What letters can be read the same upside down as right side up?
Perimeter's Letter
Challenge 6: Which Way?
Which Way?: How many different ways are there to get to your destination?
Challenge 7: Double or Not
Double Or Not: How much is your time worth?
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Challenge 8: Stamps
Stamps: Can you combine 33 and 15-cent stamps to make $1.77 in postage?
Cargue Retos Matematicos la version PDF Espanola.
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