CoolMath.com offers online math games that help students ages 3+ with basic math lessons, including addition, subtraction, multiplication, division, decimals, money and more.
CoolMath4Kids.com is appropriate for ages 3 through 12 and CoolMath-Games.com includes math games for pre-K students.
Exploratorium has a website that teaches students about science and art. Send students to a faraway galaxy or deep to the bottom of the ocean.
Pre-K to seventh grade, you can beat the boredom and keep your math skills sharp with dozens of games that focus on everything from counting to algebra on Math Game Time’s website.
Designed for kids in kindergarten through fourth grade, the Mystery Science website recently made dozens of its lessons — which range from 15 to 90 minutes — completely free.
NASA Kids’ Club helps children in pre-K through fourth grade learn the ins and outs of NASA’s missions using hands-on educational games. There’s also a "Now in Space" slideshow that introduces budding astronauts to the crew currently orbiting Earth on the International Space Station.
On National Geographic Kids, students of all ages can enjoy science experiments, animal watch cameras and a ton of activities to keep them busy for hours.