Englishfor English speakers
twelve
Determiner
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(ordinal twelfth) Twelve is the number that is after eleven and before thirteen. In numerals, it is 12.
Twelve eggs make a big omelette.
twelve
Noun
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The number 12.
and ten makes twelve.
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A set of twelve things or persons.
The twelve are never alone.
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To be twelve years old.
This girl is twelve.
thirty
Determiner
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(ordinal thirtieth) The number 30.
I had my first child when I was thirty years old.
thirty
Noun
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The number 30.
tens is thirty.