Numerals are devided into cardinals (cardinal numerals) and ordinals (ordinal numerals).
In turn cardinals are divided into:
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basic cardinals: нуль (zero), один (one), два (two), три (three), чотирнадцять (fourteen), сто десять (hundred and ten), тисяча (thousand) etc.
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fractions: одна шоста (1/6), дві сьомих (2/7), пів (half), півтора (one and a half) etc.
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assembled: двоє (two), четверо (four), п'ятеро (five) etc.
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undesignated cardinals: багато (many/much), мало (few/little), кілька (few/little) etc.
Ordinal numerals are formed by adding endings -ий/ій, -а/я, -е/є, -і to the corresponding cardinal numerals depending on the gender and number, which makes them look like adjectives of hard and soft groups.
For example:
дванадцять (twelve) + ий = дванадцятий (twelfth): masculine, singular;
дванадцять (12) + а = дванадцята (12th): feminine , singular;
дванадцять (12) + е = дванадцяте (12th): neuter , singular;
дванадцять (12) + і = дванадцяті (12th): plural.