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This is a game that is sure to sharpen players' basic math skills. Players must use four randomly selected numbers to create an equation that equals a fifth number.

$1 - $5 per group Ages 8 - adult 30 to 45 minutes
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In this activity, learners use cooperation and logical thinking to find solutions to network problems on the playground.

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners follow clues to find five puzzle pieces, then assemble them. This activity works well with a whole group, individuals, or families.

1 cent - $1 per group Ages 6 - 14 10 to 30 minutes
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This puzzle provides an interesting context which challenges learners to apply their knowledge of the properties of numbers.

1 cent - $1 per student Ages 11 - 14 5 to 10 minutes
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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.

1 cent - $1 per group Ages 8 - 14 5 to 10 minutes
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In this activity, learners will put a set of containers in order by capacity. Would the tallest container hold more or less water than the wide, short one?

free Ages 4 - 14 5 to 10 minutes
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This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

free Ages 8 - 18 10 to 30 minutes
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Learners make a counting/estimating jar to exchange with friends or bring home.

1 cent - $1 per student Ages 4 - 14 10 to 30 minutes
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This is a deceptively simple game to teach strategy, planning, and pattern analysis. In this game, learners take turns removing tokens from a board, and develop a plan to take the last piece.

free Ages 4 - 14 10 to 30 minutes
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In this activity, learners use a model for how fishing affects marine life populations, and will construct explanations for one of the reasons why fish populations are declining.

$5 - $10 per group Ages 8 - 14 30 to 45 minutes
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This activity (on pages 21-32 of PDF) has learners act out several classic brain teasers.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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In this activity, the learner asks yes-no questions to identify a secret object (similar to Twenty Questions). This game is easy to adapt for different ages and different kinds of contexts.

free Ages 4 - 14 5 to 10 minutes
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In this activity, learners take on the role of a carbon atom and record which reservoirs in the carbon cycle they visit.

$10 - $20 per group Ages 11 - 18 30 to 45 minutes
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In this game, learners walk through an imaginary Carbon Cycle and explore the ways in which carbon is stored in reservoirs and the processes that transport the carbon atom from one location to another

free Ages 11 - 18 45 to 60 minutes
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In this math game (Page 17 of the Are You Game? PDF), learners investigate probability by tossing coins.

1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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As learners play this challenging strategy game, they build understanding of area and perimeter. On each turn, a player draws a line between two dots next to each other on the grid.

free Ages 8 - 14 10 to 30 minutes
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This activity focuses on interactions within Earth systems and the effects of human activities. In this activity learners build a biomass pyramid.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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This PDF contains 12 calendars (12 months). Each month contains activities about math. Things to do on familiar holidays (like July 4), less common holidays (like Backward Day), and any day.

free Ages 4 - 14 45 to 60 minutes
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This strategy game has simple rules but can be a challenge. Players start with an empty hexagonal grid. On each turn, a player initials one empty hexagon on the grid.

free Ages 8 - 14 10 to 30 minutes
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In this online Flash game, learners test their engineering know-how, moving a collection of mechanical parts onto a board to make complete a system of parts that will move a ball from start to finish.

free Ages 6 - 14 5 to 10 minutes