Calculator Note is a handy application that lets you do simple math calculations on your smartphone. You can add multiple sheets to your app and rename them, so it's easy to keep track of your daily expenses. You can add an entry for each expense and each day of the week, so you won't have to write down your expenses every time.

It's a very simple-to-use app, so even if you don't know how to do complex calculations, you can still use it. You just need to select the type of calculation you want to perform and then enter the required input, and the result will be presented to you.