無料で、楽しく、効果的に数学を学ぼう！
Learn by Solving
Work every problem yourself on an interactive board. Each step is a move you choose, every line is checked, and graphs are drawn by hand.
Solving is a game of legal moves. You pick the move; every line follows from the one before it.
Build Your Math Streak
Stay consistent and watch your progress grow! Track your daily math habit, protect your streak with freeze days, and earn rewards for showing up every day.
12 days streak
Return tomorrow to keep your streak!
January 2026
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Double or Nothing
Day 5 of 7
Streak Freeze
2 left
You're Not Alone in This
Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Math is better with friends!
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Promotion zoneEvery way to learn
Read, listen, test yourself, ask the AI about your own steps, or look up anything you've already covered. Every lesson meets you where you are.
An equation is a claim: the two sides name the same number. The equals sign asserts sameness, it gives no orders.
A solution is a value of the unknown that makes the claim true. Substitute it and both sides agree.
Solving means changing the form without changing the claim - the same move applied to both sides keeps the balance.
Prove Your Skills
Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your math has come.
Certificate of Completion
Math Fundamentals
Add to LinkedInよくある質問
数学は独学できますか？
数学を学ぶ一番よい方法は何ですか？
数学が上達するにはどうすればよいですか？
Coddy の数学レッスンは無料ですか？
Coddy の数学スペースでは何を学べますか？
数学を定着させるにはどう勉強すべきですか？
