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I was taught that generally numbers in Japanese should be read as:

```

    123 => ひゃく　にじゅう　さん
    
```

However, I was wonder if there is any case where the numbers are read one-by-
one, like:

```

    123 => いち　に　さん
    
```

I was thinking maybe for license plate numbers and room numbers, but I am not
sure which method would be appropriate. If both are used, is there a
connotation to using one pronunciation over the other?
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2017-01-17T17:52:43.713
42617
2017-01-17T18:57:36.827
11825
question
readings numbers
Reading numbers in Japanese numeral-by-numeral instead of as a number
Room numbers for sure, another example I thought up of is phone numbers. Phone
numbers are primarily spoken in just digits. PIN codes and the like are also
spoken in just digits, sometimes people will use a word to help remember the
digits. e.g. 8931 (は・く・さ・い)
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2017-01-17T18:57:04.837
42619
2017-01-17T18:57:04.837
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answer
The first case is generally used for numbers representing quantity or amount
like:

```

    price, age, weight, distance, time
    
```

The second case is generally used for numbers representing identifier like:

```

    phone numbers, license plate, room numbers
    
```

The difference between two cases is importance of number of digits, I think
so.

Rarely, the second case is used for informing any numbers that is **very**
important. For example, military affairs.
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2017-01-17T18:57:36.827
42620
2017-01-17T18:57:36.827
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answer