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20+20 Calculator – Simple, Elegant, and Beautiful for teachers Experience the perfect blend of simplicity and style with our modern calculator app. Designed for quick calculations with a focus on clarity and usability to easly count the marks for your students. Key Features: ✨ Intuitive Interface – Clean 2x2 button layout for easy one-handed operation 📊 Dynamic Color Display – Watch the sum display change colors as your calculations grow, creating a visual progression from cool blue to vibrant red 🌙 Dark & Light Mode – Switch between themes with a single tap, perfect for any lighting condition 📝 Calculation History – Keep track of your last 5 saved calculations. Never lose important results again 🎯 Large, Clear Display – Extra-large numbers and operation tracking so you can see exactly what you're calculating ⚡ Lightning Fast – Instant calculations with smooth, responsive interface 🎨 Beautiful Design – Modern gradient styling with carefully crafted aesthetics and smooth animations Perfect For: Quick addidng calculations Students and professionals