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数词分为两大类：基数词和序数词。
基数词：one, two, three, four, five, six, seven, eight, nine, ten。
序数词：first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth.序数词前通常用the。
基数词变序数词规律：
123特殊记，8去t,9减e；
ve要用f替，然后再加th；
整十变化需注意，把y去掉加ie；
如果遇到几十几，只变个位就可以。
数词hundred、 thousand、 million不用复数，如：
three thousand
“复数+of”可表示数百、数千、数百万，如：
thousands of trees（数千棵树）
在表达年龄时，注意以下表达法：
He is six years old.（其中year须用其复数）
He is a six-year-old boy.（其中year不用复数）
分数：由基数词和序数词构成，分子用基数词，分母用序数词，当分子超过“1”时，分母用复数，如：
two thirds=2/3 three fifths=3/5
练习题
1.They have learned about______in recent years.
A.several hundreds English words
B.hundreds of English words
C.hundred of English words
D.several hundred English word
2.Nancy is_____girl.
A.a eighteen-year-old
B.an eighteen-years-old
C.a eighteen-years-old
D.an eighteen-year-old
3.Nowadays_____of business letters are written in English.
A.two third
B.two thirds
C.two three
D.second three
5.My pet dog is______(three) years old.
6.My grandmother lives on the______(ten) floor.