Beginner level

Numbers (or Cardinal Numbers). The cardinal numbers are one, two, three, etc. (as opposed by first, second, third, etc., which are known as ordinal numbers). Cardinal numbers are used to specify quantity. They are part of the group of determiners known as "quantifiers."

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  If two wrongs don't make a right, try three wrongs. (Canadian educator Laurence Peter)
  
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  One loyal friend is worth ten thousand relatives. (Greek Tragedian Euripides)
  

Read more about "quantifiers" on the determiners page.

Indefinite Determiners. The most common indefinite determiners (called "indefinite adjectives" in traditional grammar) are no, any, many, few, several, and some. Indefinite determiners modify nouns in a non-specific way usually relating to quantity. Like numbers, they are part of the group of determiners known as "quantifiers."

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  If you live to be one hundred, you've got it made. Very few people die past that age. (Comedian George Burns)
  
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  If this is coffee, please bring me some tea; but if this is tea, please bring me some coffee. (US President Abraham Lincoln)
  

Read more about indefinite determiners/adjectives.