iOS 11 Bug: Typing 1+2+3 Quickly in the Calculator App Won't Get You 6

A bug in the built-in Calculator app in iOS 11 is getting some major attention this week, despite the fact that it's been around since iOS 11 was in beta testing.

At issue is a calculator animation that causes some symbols to be ignored when calculations are entered in rapid succession. You can try it for yourself: Type 1+2+3 and then the equals sign into the Calculator app quickly.

Due to animation lag introduced when adding two or more numbers together, your result is more likely to be 24 than 6.

The same goes for many other calculations -- the Calculator ignores some inputs unless you're entering numbers slowly enough to account for the light-up button animations that highlight the keys that are being pressed. Symbols do not register when tapped while a number button is still highlighted, resulting in incorrect calculations if you're inputting numbers quickly. Reddit user cplr describes the problem:

Any iOS developers will see what is wrong here: the bug is that the animation that lights up the button is blocking touch events until the animation completes. This is the default behavior for animations, but to make an app feel responsive it's best to find a way around that (it can be a one line fix, but sometimes it is complicated).

There are hundreds of complaints about the problem on reddit this week, but it's an issue that's been discussed on the MacRumors forums since the iOS 11 beta testing period. Throughout the beta testing process, the animation lag was not addressed, nor has it been fixed in any of the iOS 11 updates released so far. It's also still present in iOS 11.1.

Some users have experienced similar issues when using older versions of iOS, but the animation lag is noticeable enough in iOS 11 to make the Calculator nearly unusable when attempting to make rapid calculations.

Apple seem to be aware of the issue, because as The Loop points out, Apple employee Chris Espinoza says more than 70 people have filed a Radar report on the bug, alerting Apple to the problem. With it receiving so much attention, we could potentially see a Calculator fix in the next iOS 11 update.


In the meantime, iOS users who need a reliable alternative can use third-party apps like Calcbot and PCalc.

Top Rated Comments

(View all)
Avatar
32 months ago
A calculator app is supposed to be a high school level project. Yet apple cannot get it right. This is extremely embarrassing.
Score: 96 Votes (Like | Disagree)
Avatar
32 months ago
This is the calculator that provided the data that said the notch was a good idea.
Score: 53 Votes (Like | Disagree)
Avatar
32 months ago
1+2+3 = 23, Courage!
Score: 45 Votes (Like | Disagree)
Avatar
32 months ago
Odd, animation for the + button slows down the actual input of addition. You have to wait for + animation to complete for it to take the rushed 2nd addition.

You would figure That turning on “reduce motion” would help a little, but no.

Maybe I can have my boss calculate my raise before this is fixed!!
Score: 38 Votes (Like | Disagree)
Avatar
32 months ago
The calculator must be using that New Math we keep hearing about.
Score: 28 Votes (Like | Disagree)
Avatar
32 months ago
Wait.. does that mean 1+2+3 is not 24?
WHAT! :eek:
Score: 27 Votes (Like | Disagree)

Top Stories

Apple Acquires Weather App Dark Sky

Tuesday March 31, 2020 10:22 am PDT by Juli Clover
Apple has acquired weather app Dark Sky, Dark Sky's developers announced today. Dark Sky is one of the most popular weather apps on the App Store, known for its accuracy and storm warnings. Our goal has always been to provide the world with the best weather information possible, to help as many people as we can stay dry and safe, and to do so in a way that respects your privacy. There is no ...

Zoom Accused of Misleading Users With 'End-to-End Encryption' Claims Amid Other Security Issues [Updated]

Wednesday April 1, 2020 2:47 am PDT by Tim Hardwick
Zoom is facing fresh scrutiny today following a report that the videoconferencing app's encryption claims are misleading. Zoom states on its website and in its security white paper that the app supports end-to-end encryption, a term that refers to a way of protecting user content so that the company has no access to it whatsoever. However, an investigation by The Intercept reveals that...

Case for Upcoming Low-Cost iPhone Shows Up at Best Buy With Alleged April 5 Stock Date

Monday March 30, 2020 4:25 pm PDT by Juli Clover
Apple has a new low-cost iPhone in the works, which is supposed to be launching sometime in the first half of 2020. Given the ongoing situation in the United States and other countries, it's been unclear if the device is going to launch within the planned timeline, but there are signs that it could be coming soon. We started seeing cases for the new low-cost iPhone back in early February,...

Bloomberg: Apple's 5G iPhone Still on Schedule for Fall Launch, But Future Products Could Be Delayed

Monday March 30, 2020 2:40 am PDT by Tim Hardwick
Apple's 5G iPhone is still on track to launch within the company's typical annual fall release schedule, according to a new Bloomberg report on filed on Monday. Signs are that Apple's Chinese-centric manufacturing -- of which Hon Hai is the linchpin -- is slowly getting back on track. The next iPhones with 5G wireless capabilities remain on schedule to launch in the fall, partly because mass...

Testing Brydge's New Pro+ Keyboard With Trackpad for iPad Pro

Monday March 30, 2020 2:04 pm PDT by Juli Clover
Well ahead of when Apple introduced trackpad support in iOS 13.4, Brydge announced an iPad Pro keyboard with a built-in multi-touch trackpad. We have one of Brydge's new Pro+ keyboards on hand, and thought we'd check it out to see how it works with Apple's new 2020 iPad Pro models. Subscribe to the MacRumors YouTube channel for more videos. The Brydge Pro+ keyboard is similar in design to...

Apple's Work on New Upcoming Products Progressing Normally as Employees Adjust to Telecommuting

Monday March 30, 2020 11:58 am PDT by Juli Clover
Apple's development of upcoming products is progressing as usual despite the fact that Apple employees around the world are working from home, according to a new report today out from Bloomberg. Apple is still working on new versions of the HomePod, Apple TV, MacBook Pro, budget iPads, Apple Watch, iPhone, and iMac, all of which could be released "as early as later this year" and have been...

Apple Releases ProRes RAW Beta for Windows

Monday March 30, 2020 9:33 am PDT by Juli Clover
Apple today released ProRes RAW for Windows in a beta capacity (via Mark Gurman), with the software designed to allow ProRes RAW and ProRes RAW HQ video files to be watched in compatible applications on Windows machines. According to Apple, the software will let the files be played within several Adobe apps: Adobe After Effects (Beta) Adobe Media Encocder (Beta) Adobe Premiere...

Apple Configurator 2 Updated With New Features, Including Support for Restoring Firmware on 2019 Mac Pro

Tuesday March 31, 2020 5:34 am PDT by Joe Rossignol
Apple Configurator 2 has been updated to version 2.12 with several improvements, including support for restoring firmware on the 2019 Mac Pro. The release notes:• Added support for restoring firmware on the 2019 Mac Pro • Allow access to websites using TLS 1.0 and 1.1 • VPN: Configure Provider Designated Requirement for Custom SSL connection type • VPN: Configure network options for ...

Seemingly Unreleased Version of Logic Pro X With Live Loops Appears on Apple's Education Site [Updated]

Sunday March 29, 2020 7:23 am PDT by Hartley Charlton
Update: Apple has replaced the Logic Pro X image with an older version. Original story follows. A seemingly unreleased version of Logic Pro X has appeared on Apple's education site, as spotted by a Reddit user. The image from Apple's education products page shows a 16-inch MacBook Pro running Logic Pro X, but with a familiar interface that looks extremely similar to GarageBand's Live Loops ...

Apple's 2020 MacBook Air vs. 2020 iPad Pro

Wednesday April 1, 2020 2:45 pm PDT by Juli Clover
Apple in March updated both the MacBook Air and the iPad Pro, and with the iPad Pro increasingly positioned as a computer replacement, we thought we'd compare both new machines to see how they measure up and which one might be a better buy depending on user needs. Subscribe to the MacRumors YouTube channel for more videos. We're comparing the base model 12.9-inch iPad Pro and the base model...