Race to double numbers in this competitive card game. Try one-digit or two-digit numbers, or more!

This two-ingredient dough, sometimes called "moon sand," is a quick and cheap way to let kids explore their senses, build fine motor skills, and play.

Challenge your high school student to find the flaw in this short mathematical proof that one is equal to two.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

Does your child need counting help? Here's a simple game that kids can do at home to help them practice counting to two-digit numbers.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Forget model kits! Promote creativity by having your child construct a dinosaur model using marshmallows and toothpicks.

In this activity, your child will reflect on one role model in their life or research one historical figure that has displayed perseverance. Then, they will create a slideshow presentation or poster that defines and illustrates perseverance.

Sharing can be a challenge, and division doubly so! Practice halving numbers in this competitive card game.

Engage your third-grader in this version of the classic game and she will get lots of practice using mental math to solve addition and subtraction problems.

This game reinforces the meaning of the term "multiples" and is fast enough to hold the attention of your fourth-grader.

This variation of Duck, Duck, Goose is played in pairs, which means a lot more activity for participants!

This project compares the strength of one, two, and three-ply toilet paper.

In this project, you will observe and record changes in sunspots over two weeks.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

Monitor the impact learning how to play chess has an academic performance. Divide subjects into two groups compare GPA

Young artists will combine two animals into one in this imaginative art-project-slash-game!

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

Administer IQ tests to volunteers. have one group practice typical IQ test problems. Then compare results of the two groups.

Coil your daughter's two favorite colors into a wearable pendant with just a few scraps of felt!

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

Transform a single sheet of card stock into a double-sided painting of opposites: on one side, a bright daytime landscape, on the other, a dusky evening scene.

Science fair project that models the subterranean movement of water, using Darcy's Law. How can this information be used in hazardous material spills?

Drift away with this charming craft that lets your child create a paper hot air balloon or two.

Study science with your first grader in this arts and crafts activity that models the reason why fall leaves change color with some paint and crayons.

Determine whether a hot liquid cools off faster when liquid is added before or after a two minute wait.

Help your first grade child figure out contractions and their original two words by playing this simple game, Contraction Concentration!

All your preschooler needs to create a personalized Halloween memento is their two hands and some black paint.

In this science fair project, young children discover what happens when two fluids that have different densities get together.

In this activity, your child will experience multitasking, then mindfulness and compare the two in terms of productivity and calmness.