Based on the users' reviews of the Subtraction Flash Cards Quiz app, here are three cons and pros in English, with 15 words or less for each item: **Cons:** 1. Some users find the app's content too limited, especially for advanced math skills. 2. A few reviewers experience technical issues, such as crashes or slow loading times. 3. A small number of users feel the app's design is not visually appealing or user-friendly. **Pros:** 1. Many users praise the app's effectiveness in improving their subtraction skills and confidence. 2. Reviewers appreciate the app's concise and easy-to-understand instructions for each question. 3. Several users find the app's adaptive difficulty level adjusts well to their learning pace.