80 90 100 twenty thirty forty fifty sixty seventy eighty ninety
one(a) hundred 23 35 101
twenty-three
thirty-five
one hundred and one
1000→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) 3、序数词：表示顺序的数词叫序数词。 1、英语的序数词基本变法：
(1) 一般在基数词后加th,(2)-ve结尾的改为-fth,(3)-ty结尾的改为-tieth,(4)熟记特殊词。 2、序数词如下： 1st 2nd 3rd 4th 5th 6th
7th 8th 9th 10th 11th
12th ※first ※second ※third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth 13th 14th 15th 16th 17th 18th 19th
thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth 20th 30th 40th 50th 60th 70th 80th 90th
100th twentieth thirtieth fortieth fiftieth sixtieth seventieth
eightieth ninetieth one undredth 21st 22nd 23rd 35th
101st twenty-first twenty-second twenty-third
thirty-fifth
one hundred and first
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