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Mechanical Grabber
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In this engineering activity, challenge learners to make a "grabber" that can pick up trash. Learners use simple materials to create pinchers that can grab small items.

Circle Logic
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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.

Guesswork
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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.
Dowels and Rubber Bands I
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If you have 3-foot dowels and rubber bands, you can can started on this fun and open design challenge. You can make structures big and small: make it so you can fit your parent into it!

Pendulum Time
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In this activity, learners explore how the pendulum has been a reliable way to keep time for centuries.

Chair Lift Challenge
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In this activity, learners explore the unique challenges in transportation engineering, such as devising a method for skiers or hikers to get to the top of a mountain.

Build a Band
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In this design challenge activity, learners build a four-stringed instrument that can play a tune.

Life in the Sidewalk Cracks
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In this activity, learners compare plant and animal life in different habitats including a sidewalk crack and lawn. Learners sort human-made materials and natural materials found in each habitat.

Build a Better Roof
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In this activity, learners will engineer a roof using simple materials to protect a construction paper person from a rainstorm.

Four-Sock Drawers
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These puzzles use four colors of socks in a drawer to get learners thinking algebraically.

Knowing North: Understanding the Relationship between Time and the Sun
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This activity shows how our experience of the Sun changes with time and location. The sun dagger at Chaco Canyon is thought by many to be a sort of ancient timekeeping device.

Cranking Bird
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In this activity, learners build a mini crank machine to make a bird "fly." This engineering activity introduces learners to automata, rotational motion, cranks and cams.

Dispenser Designs
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In this activity, learners explore how engineers work in a team to solve problems.

Temperature Tactics
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In this activity, learners explore the devices used over time to measure changes in temperature.

Launch Altitude Tracker
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In this activity, learners construct hand-held altitude trackers. The device is a sighting tube with a marked water level that permits measurement of the inclination of the tube.

Using Ohm's Law to Build a Voltage Divider
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In this activity, learners apply Ohm’s Law to construct voltage divider circuits. Learners discover how to read resistor codes and calculate resistor values.

Fantastic Fractions
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In this math lesson, learners compare pattern blocks to visually understand halves, thirds, and sixths.

Toe-Tac-Tic
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In this activity, learners play a game similar to Tic-Tac-Toe. In this version, learners try NOT to get three-in-a-row. The player who gets three-in-a-row first loses!

Momentos de Mixing in Math: Varias Actividades Matemáticas de 5 ó 10 Minutos
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Los Momentos de Mixing in Math son actividades de 5 a 10 minutos que mantienen a los chicos ocupados, aprendiendo sobre el mundo, y usando matemáticas por su cuenta.

A Question of Balance
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In this activity, learners explore how engineers use scales and measures when designing a manufacturing process to ensure that final products are uniform in weight or count.