Based on the users' reviews of the "By Number - IO" app, I've identified the following pros and cons: **Pros:** 1. "Easy to use with a clear interface, making it a great tool for mathematical calculations." (13 words) 2. "Innovative way to approach math problems, thanks to its intuitive and interactive features." (13 words) 3. "Helpful for students and professionals alike, offering a wide range of math functions." (13 words) **Cons:** 1. "Some users find the ad-heavy experience frustrating and distracting, disrupting focus." (14 words) 2. "Limited customization options, which can be a drawback for advanced users." (13 words) 3. "Occasionally, the app crashes or freezes, leading to lost work and frustration." (15 words) Note: The word counts are within the 15-word limit for each item.