I made the ad to be shown only after the banner ad has finished loading. The advertising ID has been changed to another advertising ID registered in the Play Store.
When you need to make multiple calculations at the same time, you can add up to dozens of calculators and keep records.
Click on the resulting number on the calculator. You can view the calculated past records as a list.
You can easily delete and add calculators. You can change the background color in settings.
