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In this fun sticker activity, learners will create a size wheel with images of objects of different size, from macroscopic scale (like an ant) to nanoscale (like DNA).

In this activity, learners shrink the scale of the vast solar system to the size of their neighborhood.

In this online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement.

In this activity related to Archimedes' Principle, learners use water displacement to compare the volume of an expanded gummy bear with a gummy bear in its original condition.

Get all wrapped up in a lesson about skin!

In this classic hands-on activity, learners estimate the length of a molecule by floating a fatty acid (oleic acid) on water.

This activity puts a mathematical twist on the familiar “guessing jar.” No guesses allowed, estimates only.

In this health, cooking, and math activity, learners explore nutrition and examine nutrition labels.

This is an activity (on page 2 of the PDF under Surface Area Activity) about surface area to volume ratio.

In this activity (on page 2 of PDF under GPS: Sea Turtles Activity), learners will model how a sea turtle population changes over time, from eggs to adults, using puffed rice.

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