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CURIOSITY-FIRST STEM FOR GRADE 2 AND UP

Ask better questions.

Fun STEM lessons and free practice apps. Wonder first, then explore, then try it yourself. If you can read, you can use it. Made for kids and the grown-ups who learn with them.

FreeGrade 2+No sign-up
A glowing lightbulb with a circuit-style brain inside, surrounded by floating math and science symbols on a dark navy background.

PRACTICE ZONE

Play free apps

Short, fun games that go with our lessons. Pick one and play. Free and no sign-up. Anything the apps save, like scores, stays on your device.

Multiplication X: a glowing X with a sample 7 × 8 card and a Facts known 48 out of 144 progress bar on a navy circuit background

BEGINNER MATH · 144 facts

Multiplication X

Type the answer. Pick tables 1 to 12. Play 10 or 20 cards and watch your facts known grow.

Play Multiplication X →

Free. Opens in a new tab. Score stays on your device.

Learn first: What Is Multiplication? →
Addition X: a glowing X with a sample 8 + 7 card and a Facts known 12 out of 66 progress bar on a navy circuit background

BEGINNER MATH · 66 facts

Addition X

Type the answer. Pick your numbers. Play 10 or 20 cards and watch your facts known grow.

Play Addition X →

Free. Opens in a new tab. Score stays on your device.

Learn first: What Is Addition? →
Subtraction X: a glowing X with a sample 12 minus 7 card and a Facts known 20 out of 55 progress bar on a navy circuit background

BEGINNER MATH · 55 to 210 facts

Subtraction X

Type the answer. Choose within 10 or within 20, then try fact families and missing-number cards.

Play Subtraction X →

Free. Opens in a new tab. Score stays on your device.

Learn first: What Is Subtraction? →
Division X: a glowing X with a sample 56 ÷ 8 card and a Facts known 48 out of 144 progress bar on a navy circuit background

INTERMEDIATE MATH · 144 facts

Division X

Type the answer. Pick your divisor tables 1 to 12. Play 10 or 20 cards and watch your facts known grow.

Play Division X →

Free. Opens in a new tab. Score stays on your device.

Learn first: What Is Division? →
Periodic Table X: a glowing X, a small map of all 118 elements, and a Sodium card with its atom rings on a navy circuit background

BEGINNER SCIENCE

Periodic Table X

Tap any element. See its atom, what it is used for, and a fun fact. Then try Quiz me.

Explore Periodic Table X →

Free. Opens in a new tab. Quiz score stays on your device.

Learn first: What Is the Periodic Table? →
The Solar System in order, from the Sun out to the dwarf planets. Order only, not to scale.

BEGINNER SPACE · 35 objects

Solar System X

Explore 35 worlds, moons and more. Tap one to see where it is and how big it is.

Typing X: Rocket Launch: a glowing X, a sample row of words being typed, WPM, accuracy and goal boxes, the home row keys A S D F and J K L semicolon, and a rocket on a navy circuit background

BEGINNER TYPING · 3 levels, 16 lessons

Typing X

Type the words to fly your rocket. Start at the home row, pick Beginner, Intermediate or Advanced, and reach your goal speed and accuracy to dock at the space station.

Play Typing X →

Free. Opens in a new tab. Works best with a real keyboard. Progress stays on this device.

Learn first: How Do You Learn to Type? →

See everything in the Practice Zone →

FREE LESSONS

Latest lessons

Pick a lesson. Math lessons have a matching app to play.

What Is the Solar System? The Sun with colored orbits around it on a navy circuit background, with a BEGINNER badge

NEW SERIES

The Solar System: start here

What is the solar system? How far apart are the planets? Read the intro, then explore every world in the free Solar System X app.

What Is the Periodic Table? A small map of all 118 elements as colored squares on a navy circuit background, with a BEGINNER badge

NEW SERIES

The Periodic Table: start here

What is an element? Why is the table shaped like that? Read the intro, then meet Hydrogen, Helium, Lithium, Carbon and Oxygen.

See all lessons →

HOW IT WORKS

Ask. Explore. Apply.

Three simple steps in every lesson.

STEP 1

Ask

Start with a curiosity question. Not a quiz, just something to wonder about.

STEP 2

Explore

See what, how, why and when with simple pictures and examples.

STEP 3

Apply

Try it, spot it in real life and talk it over with a grown-up.

A shield with a heart and a check mark, showing a safe place for families.

FOR GROWN-UPS

A friendly extra for home or summer

Made for Grade 2 and up. If you can read, you can use it. Supplemental STEM aids, not a school curriculum. Everything here is free. No sign-up, and the practice apps keep the score on your own device.

About K12 Summer Workbooks →
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K12 Summer Workbooks

Ask better questions

Free for families. Fun STEM lessons and practice apps for Grade 2 and up. No sign-up.

PLAY

Multiplication XAddition XSubtraction XDivision XPeriodic Table XSolar System XTyping X

LEARN

All lessonsMathSTEMEngineeringAIPeriodic TableSolar System

EXPLORE

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Supplemental STEM aid for home or summer learning — not a school curriculum replacement. Adult supervision recommended for screen time.

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