From a tricky equation to finding your saved working, start with these common questions.
Check the instruction for the current step. Enter the requested expression, number or full bracket in its own field. Use brackets around whole numerators, denominators and square-root expressions. When a final answer asks for two decimal places, enter two decimal places. Reveal answer shows the expected entries without changing your working.
Use Hint for guidance or Reveal answer for a read-only explanation. Neither fills your answer fields or completes the question. Undo lets you return to your previous accepted step.
Practice is saved separately from lessons. Return to the same topic’s Practice equations button and choose Resume when it is offered. Opening lessons does not replace your practice working.
The app saves progress locally and does not offer account-based sync. Keep the app installed if you want to retain that local progress. Your iPhone’s backup and restore options are managed by Apple.
Open Practice equations on a topic card and select Beginner, Intermediate, Advanced or Random. Random mixes all levels. Starting a new question keeps lesson completions separate from practice.
No. All current lessons, worked examples and curated practice are available offline. Your place is saved locally on your iPhone.
Include your iPhone model, iOS version, topic, lesson or practice question, and a short description of what happened. A screenshot of the equation and feedback is helpful. Please leave out sensitive personal information.
Want to know how your progress is stored? Read the privacy policy.
