Pop-up ads, fake X-out button. Deleted. – Calculator HD++ Review

Pop-up ads in the middle of a calculation. Concentration destroyed. Big ad banner at the bottom, overlaying the keys. When I tapped the big circled X button to get rid of the ad, it took me to the App Store anyway to buy an upgrade. Upgraded by deleting this app and downloading a different calculator, one without pop-ups.
Review by pull me back to earth on Calculator HD++.