专题五数词1 one 13 thirteen 20 twenty 100 one hundred2 two 14 fourteen 30 thirty1,000 one thousand3 three 15 fifteen 40 forty1 000及以上的数字,从后面向前,每三位加“,”,第一个“,”前为thousand ,第二个“,”前为million ,第三个“,”前为billion4 four 16 sixteen 50 fifty5 five 17 seventeen 60 sixty6 six 18 eighteen70 seventy7 seven 19 nineteen 80 eighty8 eight这7个词都以teen 结尾90 ninety9 nine这8个词都以ty 结尾10 ten11 eleven12 twelve第一到第十 第十一到第十九 第二十及以上first eleventh twentiethsecond twelfth thirtieththird thirteenth fortiethfourth fourteenth fiftiethfifth