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In this activity, learners use sieves with different-sized holes to sort balls by size.

In this activity, learners play a card game that explores the relative sizes of various objects. Learners compete to organize their hand of cards into lists of objects from largest to smallest.

In this game, learners explore the different sizes of things in the world. In this Twister-like game, learners must place a hand or foot on a circle of the right scale - macro, micro, or nano.

In this online interactive challenge, learners choose items to represent the Earth or solar system, then determine other items to represent the Moon, or Milky Way based on their relative size.

In this activity on page 1 of the PDF, learners compare the relative sizes of biological objects (like DNA and bacteria) that can't be seen by the naked eye.

In this activity, learners explore how distance can affect the way we perceive the size of an object.

In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them.

In this activity, learners make their own pinhole viewer in order to measure the size of the sun.

This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).

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 play a card game that explores different size scales--macro, micro and nano.

In this activity about depth perception, learners create an optical illusion in a shoe box.

In this activity, learners investigate just how small a billionth of a meter is by attempting to cut a paper ruler down to a nanometer-sized sliver.

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, learners discover that a material can act differently when it's nanometer-sized.

In this activity, learners mark their height on a height chart and discover how tall they are in nanometers.

In this activity, learners find out why some mineral sunblock rubs in clear. Learners compare nano and non-nano sunblocks and discover how particle size affects visibility.

This is a hands-on activity exploring how nanoscale particles are used in mineral sunblocks to increase their transparency.

In this activity, learners explore the relative sizes and distances of objects in the solar system.

In this activity, learners observe live fish in tanks to consider how their body structures are related to their behaviors and habitats.