Saying a number digit by digit

Question

Is it okay in an informal conversation to say a number digit by digit?

For example, is it okay to say "two five six kilobytes" instead of "two hundred and fifty-six kilobytes"?

Mr. Shiny and New 安宇 · Accepted Answer

It depends. Normally, it's easier to understand numbers when presented in a familiar way.

Dates are usually presented in groups of two: nineteen eightyfour
Commonly-used numbers are sometimes abbreviated: one-twenty-eight, two-fifty-six
numbers after decimals are usually said singly: three point one four
regular numbers are almost never abbreviated: two hundred fifty six dollars

There are some exceptions when you'd want to spell the numbers out, mainly when you are trying to ensure that the number is received exactly correctly:

phone numbers: dial eight six seven five three oh nine
room numbers: room twenty-three fourteen
any other time you're dictating a number and want to ensure correct transcription, such as reading your gas meter or if you need to be sure that the person on the other end gets the value correctly

When discussing regular numbers, it's difficult to understand a number if you just say the digits one after another. That's because you don't know how big the number is until the person stops saying it. 604893480264 is a big number, but if read aloud digit by digit the person has to wait until the last 4 before they can go back and try to remember what number they are receiving. Contrast that with six-hundred-four billion, eight hundred ninety three million, four-hundred eighty thousand, two hundred sixty four. Even if the person loses track of the number part way along, they already know the magnitude because you said "billion" right up front.

Nuclear Hoagie · Answer

It's not too common to say a number digit-by-digit in informal conversation. It's usually only used to emphasize each individual number, like in an address for example. However, it is fairly common to say just the hundreds digit of a three digit number. So, saying "two five six kilobytes" would be unusual, but saying "two fifty-six" would be OK in some contexts.

Answered by Nuclear Hoagie on May 9, 2021

Stu W · Answer

It is possible that in a loud environment you would say digit by digit in this context, especially over the phone where being succinct makes a huge difference, but you would probably abbreviate to "kay" for the bytes (or "gigs," etc.).

Answered by Stu W on May 9, 2021

200_success · Answer

Postal codes, phone numbers, and similar numeric identifiers are usually spoken as digits.  (One indicator that you should read them as digits is that zeroes, especially leading zeros, are significant.)  For all other numbers, probably not.

Sometimes, it is helpful to read numbers digit by digit for clarity.  For example, "fifteen" and "fifty" sound alike, so in aviation, such numbers are spoken as "one-five" and "five-zero", respectively; 1500 is "one-five-hundred".

But doing that in informal conversation?  You would sound weird, and you probably wouldn't be understood.  You could say it redundantly "fifteen (that's one-five)".

AmI · Answer

Saying 'two hundred and fifty six' conveys the magnitude of the number for the listener to understand, while saying 'two five six' conveys the digits of the number for the listener to copy.

Matthew Christopher Bartsh · Answer

Who says "I am two one", meaning "I am twenty-one"? Any native speaker will think you mean you have been labelled with the numerals two one, like James Bond is labelled "double oh seven".
It would be absurd. It is not the normal thing to say in English.
It's the same with kilobytes. 'Two five six kilobytes' is wrong unless there is a type of kilobyte known as a 'two five six kilobyte'
The only exception is when you are talking over a walky talky system, or there is some other interference stopping you being heard clearly.
In English numbers that refer to counting or other quantities are pronounced a normal numbers. When it is a code, or some sort of data, like a telephone number or a zip code, it is pronounced as digits. Also if it is a name, like 'five oh one' jeans.

Saying a number digit by digit

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