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In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

In this environmental science lesson, learners will examine the dangers of mercury and how humans contribute to growing mercury emissions on Earth.

This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

In this math game, learners try to earn the most points by winning stacks of four dice. Learners practice number recognition and addition skills.

In this activity, learners estimate risks associated with different events and compare their estimates to the real possibilities.

In this math lesson, learners explore polynomial and rational function patterns.

In this math lesson, learners compare products to determine the best product.

In this math lesson, learners identify, describe, and construct the five regular polyhedra.

In this math activity, learners play a game similar to 20 Questions, in which learners must identify a secret number drawn from a bag.

In this math activity, learners estimate how many pennies are in a jar by predicting and counting handfuls of pennies.

In this activity, learners use Starburst® candy to sort, classify, compare, and graph. Learners grab a handful of one-inch candy squares, sort them by color, graph the candy, and discuss the results.

In this nutrition and estimation activity (page 12 of PDF), learners estimate serving sizes of different foods and compare their estimates to serving size information provided on nutrition food labels

In this activity, learners work in NASA teams to build balloon-powered rockets using identical parts and compete to launch the greatest number of paper clips to "space" (the ceiling).

This activity helps learners learn about math through a real-world scenario. Three friends are baking cookies for their school’s bake sale.

This activity (page 2 of the PDF under SciGirls Activity: Double Dutch) is a full inquiry investigation into whether hearing or seeing has a bigger effect on jump rope performance.

In this activity, learners work in teams to investigate the relationship between mass, acceleration, and force as described in Newton's second law of motion.

This activity investigates how bark beetles can threaten forests by having learners estimate the number of infected trees from a photo.

In this math lesson, learners estimate distances between landmarks and use a map and scales to determine the actual distances.

In this math lesson, learners make estimates to analyze the number of apples per acre, and visualize the magnitude of one million.