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.

Set off an a science adventure as you prepare a row of bee homes for your new visitors.

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

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

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.

One way to "trick" your child into getting extra practice with one-step equations is to play a variation of the classic game, tic tac toe.

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.

Does "short circuit" mean that electricity takes a short course? This science experiment provides steps to help you get to the bottom of this science mystery.

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

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

Use two toilet paper rolls to make a pair of homemade binoculars and let the games begin. Here's how:

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

In this science fair project, high school students will try to determine the mathematical patterns in JS Bach's two movement preludes and fugues.

These easy-to-make felt friends are created by sewing two pieces of felt together with yarn and make great gifts for holidays such as Easter.

This recycled craft makes a great addition to the dress-up box and is a two-in-one activity and party favor for princess-themed birthday parties.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

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

Let your kid try his hand at engineering as he builds and tests two different structures made out of rolled newspaper. Which one is the strongest?

Looking for something to do with all those plastic 2-liter bottles that seem to accumulate endlessly? Turn them into a unique mini birdbath.

Create a tornado vortex in your kitchen in this 5th grade science experiment. All you need are two plastic bottles, duct tape, and a metal washer to begin.

This science fair project idea focuses on two classes of sugars monosaccharides (fructose) and disaccharides (sucrose or table sugar).

Help your child get the hang of reading with this fun activity. Here's how to make a spinning phonics wheel out of two paper plates.

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.

When it comes to working kids' muscles, nothing beats an obstacle course! Here are some easy ideas for creating your own course at home.