Oppia

Oppia is a free Chrome extension designed to make learning mathematics fun and interactive for children aged 7 to 14. It offers a comprehensive curriculum covering topics from place values to multiplication and division through engaging, story-based lessons that feel like playing a game. With expert-reviewed content, Oppia ensures effective learning backed by over 50% improvements seen in students between pre- and post-tests.

The extension supports multiple languages including English, Brazilian Portuguese, Arabic, and Nigerian Pidgin, and features downloadable lessons that allow offline access, making it perfect for learning on the go. Audio voiceovers aid new readers, enhancing accessibility for learners of all levels. Trusted by thousands of students, parents, and teachers worldwide, Oppia provides an ad-free and safe learning environment. It is backed by the nonprofit Oppia Foundation and continually updated with new content and languages.