基数词：表示数目的词叫基数词.
1、 英语中常用的基数词有：
1
2
3
4
5
6
7
8
9
10
11
12
one
two
three
four
five
six
seven
eight
nine
ten
eleven
twelve
13
14
15
16
17
18
19thirteen
fourteen
fifteen
sixteen
seventeen
eighteen
nineteen
20
30
40
50
60
70
80
90
100twenty
thirty
forty
fifty
sixty
seventy
eighty
ninety
one(a) hundred2335 101twenty-threethirty-five one hundred and one1000→one(a) thousand,10000→ ten thousand,100000→one hundred thousand ,1000000→one million,10000000→ten million,100000000→one hundred million,
108→one hundred and eight,146→one hundred and forty-six,500→five hundred ,1001→one thousand and one,1813→one thousand eight hundred and thirteen.
2、[注]：(1)百位与十位之间要加and；十万位和万位,亿位和千万位之间通常也要加and.
(2)英语用千、百万等单位计数,大数字从右向左看,每隔三位划一逗号,倒数第一个逗号之前要用thousand,倒数第二个逗号之前要用million,倒数第三的逗号之前要用billion表示.
(3) hundred、 thousand、 million作数词时,不用复数,前面可以加上one,two,…等其它数词.用作名词时复数表示“成…上…”,后面必须要有of,前面可以加上some,many,several等词.如：five hundred(五百),hundreds of(成百上千的),ten thousand(一万),thousands of(成千上万的),millions of(成百万的)