Many people (even the native speakers) have problems with these, so the following might be helpful.
For ordinal numerals written with numbers you should use case endings.
Example: 1-я, 2-й, 5-й, 10-го
You should not use the entire ending (i.e. 3-его or 5-ому is wrong).
The rule goes as follows:
If the one-before-last letter of the ending is a vowel, use one, the last letter of the ending: 1-й день, в 10-й части;
If the one-before-last letter of the ending is a consonant, use two last letters of the ending: 1-го вида, 10-му посетителю.
Do not use anything in dates: 25 апреля 1980 года.
For quantitative numerals written with numbers CASE ENDINGS ARE NOT USED.
DO NOT EVER write anything like "25-ти" or "4-тыре", or even "5ять".
For ordinal numerals written with numbers you should use case endings.
Example: 1-я, 2-й, 5-й, 10-го
You should not use the entire ending (i.e. 3-его or 5-ому is wrong).
The rule goes as follows:
If the one-before-last letter of the ending is a vowel, use one, the last letter of the ending: 1-й день, в 10-й части;
If the one-before-last letter of the ending is a consonant, use two last letters of the ending: 1-го вида, 10-му посетителю.
Do not use anything in dates: 25 апреля 1980 года.
For quantitative numerals written with numbers CASE ENDINGS ARE NOT USED.
DO NOT EVER write anything like "25-ти" or "4-тыре", or even "5ять".
no subject
Date: 2007-09-30 12:46 am (UTC)no subject
Date: 2007-09-30 12:47 am (UTC)no subject
Date: 2007-09-30 12:52 am (UTC)no subject
Date: 2007-09-30 12:57 am (UTC)no subject
Date: 2007-09-30 02:00 am (UTC)no subject
Date: 2007-09-30 06:51 am (UTC)http://spravka.gramota.ru/blang.html?id=243
Anyway, dig into this portal, it's very useful.
no subject
Date: 2007-09-30 06:53 am (UTC)no subject
Date: 2007-09-30 07:16 am (UTC)no subject
Date: 2007-09-30 07:18 am (UTC)no subject
Date: 2007-09-30 08:38 am (UTC)no subject
Date: 2007-09-30 11:38 pm (UTC)no subject
Date: 2007-10-02 04:36 pm (UTC)no subject
Date: 2007-10-03 07:27 am (UTC)no subject
Date: 2007-10-03 11:06 am (UTC)Re: :)
Date: 2007-09-30 11:38 pm (UTC)no subject
Date: 2007-10-01 05:15 am (UTC)2. Unfortunately the frequency of usage is not a proof for correctness of spelling. Look how many people use "вообщем", and this isn't even a word in Russian.
no subject
Date: 2007-10-01 05:22 am (UTC)Re: oh, my god!
Date: 2007-10-01 05:33 am (UTC)Re: oh, my god!
Date: 2007-10-01 05:53 am (UTC)Re: oh, my god!
Date: 2007-10-02 04:37 pm (UTC)no subject
Date: 2007-09-30 11:37 pm (UTC)no subject
Date: 2007-10-01 02:42 pm (UTC)no subject
Date: 2007-12-19 12:19 am (UTC)BUT 25 апреля 1980-го (without "года")