A modern and simple app icon for a math study and practice app. The icon features a flat design style with a harmonious composition based on the Golden Ratio. The background is a soft gradient from light blue to green. In the center, there's a stylized calculator with buttons displaying mathematical symbols (+, -, ×, ÷). Surrounding the calculator are geometric shapes (circle, square, triangle) and a pencil. The overall design is clean and minimalistic, using bright colors to make the icon stand out.