Google has introduced a new calculator app intended for devices such as Chromebooks. However, because it is web-based, it can also be used on iPads and so on. This means the Mountain View giant has beaten Apple to making this often essential service available on its own signature tablets.
https://www.notebookcheck.net/Google-s-new-Calculator-for-Chrome-OS-is-being-touted-as-ideal-for-iPads-as-well.597982.0.html
You should read up on what web-apps is and try this offline on an ipad.
Really impressive. You know what other system had a decent calculator program? My IBM 386 with Windows DOS that I bought used 30 years ago! C'mon 😂