I have never found a way to do this either, but here is an alternative app that 
I've found extremely useful.
Link follows the description.

Calculator HD Pro Free by Cider Software LLC
H3> 
The app developer was made aware of some changes that would make this app work 
better with VoiceOver and in three weeks he had made the changes so it now is 
fully accessible with VoiceOver. You can pay $2.99 to remove the ads which 
gives a little more display area. Here is some information from the app store 
description:

•Dual-line display lets you keep track of the Input and Result at the same 
time. 
•Backspace to delete one number at a time, Clear to delete entire input. 
•3 layouts in portrait mode: Basic, Scientific, or History Tape. 
•3 layouts in landscape mode: Basic, Scientific or History Tape. 
•Memory content is displayed next to the Input to make it easy to keep track. 
•Automatically expanding multi-line Input for really long equations. 
•Automatic scientific formatting of extremely large or small numbers. 
•Automatic addition of thousands separators in Input. 
•Automatic formatting of the decimal point as a comma for international users. 
•Accurate and powerful calculator engine. 
•3D Touch enabled to launch in a specific layout. 
•VoiceOver Accessibility with support for Touch Typing. 
Calculator HD Pro Free in the App Store: 
https://appsto.re/us/13PcI.i


HTH,
Richard


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of 
M. Taylor
Sent: Saturday, May 6, 2017 9:54 AM
To: [email protected]
Subject: A Quick Question About the Native iOS Calculator App

Hello Everyone,

Yesterday, May 5, 2017, one of the trending topics on Twitter was the
discovery that one can delete an entered figure, one digit at a time, in the
native iOS Calculator app, by simply single-finger swiping from right to
left, across the display.  In fact, there were several videos on this.  

For example, were one to enter 6275, rather than having to clear the entire
entry and retyping it, one can simply swipe to delete one digit at a time.
Consequently, the first swipe would delete the 5, in the figure listed
above, changing the entered figure to 627.

With VoiceOver disabled, I confirmed that this, does, indeed, work well.  

However, with VoiceOver enabled, try as I may, I could not discover a way to
reproduce this very handy feature.  

My question:  With VoiceOver enabled, is there a way to delete figures, one
digit at a time as described above?  

All replies welcomed.

Mark

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