grammar training

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Ordinal numbers – порядковые числительные
Why do we spell 1st, 2nd, 3rd, 4th like this?Where do the letters come from?

Look at these and notice the last two letters of the words
1st = first – первый
2nd = second – второй
3rd = third – третий
4th = fourth – четвертый
5th =fifth – пятый

1st = first (She won first prize.)
2nd = second (I live on the 2nd floor.)
3rd = third (Take the third turning on the left.)
4th = fourth (It's his fourth birthday.)
5th = fifth (This is the 5th time I've taken my driving test.)

С "teen" числами мы добавляем окончание 'th'

14th = fourteenth (fourteen + th)
15th = fifteenth (It's her fifteenth birthday.)
16th = sixteenth
17th = seventeenth
18th = eighteenth
19th = nineteenth

In long numbers, 'th' is added to the last number:
106th = one hundred and sixth
242nd = two hundred and forty-secondth
2018th = two thousand and eighteenth

Let's look at some spelling rules
4th - We have four, fourteen, forty (drop the u), fourth (don't drop the 'u')
5th - We have five, but then the 'v' become 'f' in fifteen, fifty, fifth (the 'f' helps pronounce)
9th - We have nine, nineteen, ninety, but ninth (drop the 'e')
12th - twelve, twelfth (Notice the 'v' becomes 'f')

Using a hyphen also applies to ordinal numbers from 21st.
twenty-first = 21st (It's her 21st birthday on Sunday.)
twenty-third = 23rd
sixty-sixth = 66th
seventy-seventh = 77th
eighty-second = 82nd
ninety-ninth = 99th
two hundred and twenty-first = 221st
Remember, no space between hyphen and words.

Let's look at some spelling rules with whole numbers - 20th, 30th, 40th...20th = twentieth

We have twenty and change the 'y' to 'ie' and add 'th' = twentieth (My birthday is on the 20th)
30th = thirtieth
40th = fortieth
50th = fiftieth
60th = sixtieth
70th = seventieth
80th = eightieth
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