Every four years something funny happens with our calendars -- we add a day! Why do we do this? Discover the science behind leap year.

Discover how myths explain the origins of the world with this fifth- and sixth-grade reading comprehension worksheet!

Learn about the foundational process of American democracy in this essential worksheet!

Explore the sights and sounds of the prairie with this fourth- and fifth-grade reading-comprehension activity!

What is that strange object in the sky? This prompt will be a lift off for your young writer's imagination as he creates a story to match the picture.

Learn about the human brain with this zombie-themed science worksheet!

Introduce how pronouns work and why they're so important with this informative worksheet.

Roses are red, violets are blue, I know the parts of a flower, how about you? Learn about flower anatomy with this worksheet.

The cool blue tones of this long division printable will calm your fifth grader's nerves as she sets to work learning this important fifth grade concept.

Learn what Constitution Day is and why it’s important in this engaging passage!

In this worksheet, children read the story of Parks' act of passive resistance, then follow a series of thoughtful prompts to reflect on why the boycott was successful, as well as why it inspired the support of so many people around the United States.

Ever wonder why zebras have so many stripes? Find out with this fun worksheet all about the zebra!

Learn why and how we celebrate Asian American and Pacific Islander Heritage Month with this engaging worksheet!

Learn more about why supply and demand change in this economics worksheet! 

Ever wonder why sounds change as they move away from us? Learn all about the Doppler effect with this physics worksheet.

Why did the fox cross the road? To look for the chicken! This fun worksheet is jam-packed with fun facts about foxes!

Is a book a good or service? Why? Determine whether items are goods or services in this fourth- and fifth-grade worksheet!

Ever wonder why we hunt for Easter eggs? Discover how this spring holiday was started with this interesting look at the history of Easter.

In this thoughtful opinion-writing worksheet, children will describe the season they like best, and why.

Learners will categorize 12 different types of text according to why the author would write them, using the acronym PIE as a mnemonic device.

Explore more complicated sentences as you add details about where, when, why, and how!

Children learn about the traditional Chinese Zodiac calendar — then get creative and design a calendar of their own, including a brief description of why they chose each animal.

After practicing mindfulness and compassion for a loved one and reflecting on why they love them, fourth- and fifth-grade students will choose one item from the worksheet that represents or expresses their love.

This cool physics worksheet helps kids learn how centripetal force and centrifugal force can explain why short track speed skaters don't fall over during turns.

Why is the math book so sad? It has too many problems! Help your students bring puns to life by having them create visuals to represent the play on words. Kids will have a blast reading the puns and making their own illustrations to accompany them.

Children are introduced to the concept of the speed of light in this illustrated worksheet.

Sit down for a fun science lesson with Steve the savvy scientist as he teaches you all about dominant and recessive genes!

Kids find the volume of rectangular prisms in this silly worksheet.

Print out this sign for your little bookworm to hang in his locker, or use it as a fun decoration for the library or classroom.