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    NRICH
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    In this game, learners build up six stacks of cards in the middle of the table, face up, in order from 1 at the bottom to 20 on the top. The first player to get rid of all his cards is the winner....

    1 cent - $1 per group Ages 6 - 11 5 to 10 minutes
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    NRICH
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    In this number puzzle/trick, learner #1 thinks of a number between 1 and 63. Learner #2 shows learner #1 six cards and asks them whether the cards contain their number. Learner #2 uses this...

    1 cent - $1 per group Ages 14 - 18 5 to 10 minutes
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    NCTM Illuminations
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    In this math game, learners identify the factors of a number to earn points. Although practicing a mundane skill, learners enjoy the work because of the game scenario. Built into this game is...

    1 cent - $1 per group Ages 8 - 11 45 to 60 minutes
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    Oregon Museum of Science and Industry
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    This simulated balance beam illustrates binary mathematics. You have a set of weights and the goal is to match an unknown weight, but you only have weights that have mass 1, 2, 4, 8, and 16. You...

    free Ages 6 - adult 5 to 10 minutes
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    NCTM Illuminations
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    The rules of Krypto are amazingly simple—combine five numbers using the standard arithmetic operations to create a target number. Finding a solution to one of the more than 3 million possible...

    free Ages 8 - 14 10 to 30 minutes
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    NRICH
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    In this math game, learners throw dice and place the numbers in one of four boxes. Learners repeat this three more times and the learner with the largest four digit numbers is the winner. Learners...

    1 cent - $1 per group Ages 8 - 14 5 to 10 minutes
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    WNET
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    In this Cyberchase activity, learners use the numbers one through six to solve a puzzle. Learners are challenged to arrange spiders, numbered one through six, on a triangle so that each side of the...

    1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners create an Incan counting device called a quipu (pronounced kee-poo). Similar to an abacus, a quipu is a series of strings tied together, with a complex set of knots tied in each string to...

    1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back. They turn over two tiles at a time, and try to remember past tiles so they can find...

    1 cent - $1 per group Ages 4 - 11 45 to 60 minutes
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    WNET
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    In this Cyberchase activity, learners make decoders to send and receive secret messages. Learners make the device out of two 8-ounce cups and two code strips. Then, they use it to decode Hacker&...

    1 cent - $1 per student Ages 6 - 11 10 to 30 minutes

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