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

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

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.

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.

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.

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.