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Bean Bugs
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In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.
Mystery Jars: Estimate Contents
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This activity puts a mathematical twist on the familiar “guessing jar.” No guesses allowed, estimates only.
Mystery Jars: Make Your Own: Estimating and Counting
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Learners make a counting/estimating jar to exchange with friends or bring home.
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Slide Rules
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Learners make their own simple slide rules out of paper and learn how they work.
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Number Cruncher
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In this online puzzle game, learners need to choose a path from a starting number to a goal number. Along the path are simple operations (e.g.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-682.png?itok=f_Q25Qhx)
Arithmetic
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In this online activity, learners will brush up on their multiplication, division, and factoring skills with this exciting game.
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Alien Encounter
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In this activity, learners use multiplication skills to get groups of aliens safely back to their planet.