A design professor once told me, “You don’t need to reinvent the wheel.” When given this prompt, I looked to the current calculator app on iOs. It’s already a great, clean design that does everything you want it to do. I brightened the design with blue tones and made the enter button bigger. On iOs, the 0 takes up two spaces, but I only made it take up one here to keep it on the same hierarchy as the rest of the numbers.
At the top of the calculator is a bar that shows the history of the current calculation. I know when I use a calculator I often forget what I’ve currently calculated! This will help with that issue!