Mobile Excel Calculation App

I need a mobile app that utilizes Excel for basic arithmetic calculations on number inputs. The app should be user-friendly and efficient.

Key Requirements:
- Perform basic arithmetic operations (add, subtract, multiply, divide)
- Input data primarily as numbers
- Mobile compatibility is essential

Ideal Skills and Experience:
- Proficiency in Excel and mobile app development
- Experience in creating calculation tools on mobile platforms
- Strong UI/UX design skills for mobile applications

Looking for a freelancer who can deliver a simple, effective solution within budget.