Who knew that the machines of the world are all made of just 6 simple machines working together? Introduce your child to simple machines with this worksheet.

What makes a reptile different from an amphibian?  Learn all about animal classifications in this worksheet for second and third graders!

Analyze everyday objects and identify states of matter with this second- and third-grade science worksheet!

Mix, boil, and toast your way to understanding energy transformations with this fourth-grade worksheet!