Math by Voice: Mental Math

X-PlanetMath (Math by Voice) is a voice-first mathematics learning app for children and adults.

Speak answers aloud, choose learning activities with voice commands, and explore mathematical topics step by step. Manual input is available only where it is genuinely useful.

KEY FEATURES

• voice navigation and spoken answers;
• a structured course of 10 interactive math lessons;
• addition, subtraction, multiplication, and division;
• fractions, percentages, powers, roots, and equations;
• configurable practice sessions;
• tests with increasing difficulty;
• narrated mathematical terms and explanations;
• statistics and saved progress;
• English and Russian languages;
• no advertising or required account registration.

10 INTERACTIVE MATH LESSONS

The course progresses from counting and arithmetic through fractions and formulas to equations, powers, and quadratic equations. Lessons combine spoken explanations, visual material, questions, and saved results.

VOICE PRACTICE

Choose an operation, difficulty, number of questions, and answer time. X-PlanetMath reads each problem aloud, listens to the spoken answer, and provides immediate feedback.

WHO IT IS FOR

• children learning mathematical foundations;
• students practicing mental arithmetic;
• adults maintaining calculation speed and concentration;
• learners who find spoken interaction more convenient than typing.

Microphone permission is required for voice features. Offline speech-recognition availability depends on the device and installed speech service.

Basic practice is available free of charge. Premium unlocks all operations and advanced learning modes with a one-time in-app purchase—no subscription.

Recent changes:
• Added clearer Premium prompts during the free trial.
• Premium can now be opened from mode selection and after practice results.
• Improved voice prompts for Premium access.
• Google Play Billing messages are clearer if purchase loading is temporarily unavailable.
• After the free period, Theory, Tests and Lessons are available in Premium, while Practice remains free.