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

The objective of this science fair project is to test the growth rate of a plan in a crystal medium in comparison to traditional soil.

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.

Wool can absorb 1/3 of its weight in water, while still keeping the body warm. She can test this theory by performing a scientific sock comparison!

This activity with add some fun and education to long car trips. Perfect for family vacations!

Movement activities are crucial for developing minds and bodies. Animal movements, in particular, encourage children to think about their own body mechanics in comparison with animals they may have observed.

Show your fifth grade scientist how to create a siphon using two buckets, plastic tubing, and water. Watch her astonishment as the water travels uphill!

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

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.

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

Introduce your fifth grader to the Kinara, part of the Kwanzaa tradition, by playing this fast-paced, two player game!

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

Help your third grader create a Venn diagram fantasy creature by combining two different creatures to create a fantasy creature based on their similarities.

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

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

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

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Help your child improve his coin counting skills in these two math games that have him race to reach $1.00.

Compare fractions in this two-player math game. The objective of the games is to work together to determine who has created the largest fraction.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

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

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

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

Practice multiplication facts by playing baseball in this fun, third grade math board game.

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

Make fractions easy for your child to understand by incorporating their discussion and practice into meals and cooking that you two participate in together.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.