Until today, the iPhone’s calculator mimicked the buttons of its forebears: If you keyed in 48.375, for instance, instead of 43.875, tapping “C” within your app would zero out your entry so ...

People are only just learning what the letter buttons on a calculator means (stock image) (Getty) By. Alice Sjoberg; 12:45, 28 Apr 2025; ...

People have been baffled after 'finally' learning what the letter buttons C, CE, and AC stand for on a calculator and how to use them, with some people saying they've been curious for years ...

Illustrating how this can be utilised, they penned: "For instance, if you type 1, +, 3 and then press the clear entry button, the calculator will erase the 3 but retain the 1 +.

This image shows a new backspace button on the iPhone Calculator app in iOS 18 Credit: Apple. Soon, Apple will release the iOS 18 update – likely in September.

Unlike the calculator app on the Apple Watch, the iPhone version doesn't have an obvious back button. But that's because it's hidden in plain sight.