英文写法：20 : twenty 、30 : thirty 、40 : forty 、50 : fifty 、60 : sixty 、70 : seventy、80 : eighty、90 : ninety、100 : one hundred 百位和千位数字的表达：
1、100 = one hundred 2、200 = two hundred 3、500 = five hundred 4、1,000=one thousand 5、1,100 = one thousand, one hundred; or eleven hundred 6、1,500 = one thousand, five hundred; or fifteen hundred 7、2,000 = two thousand 8、2,100 = two thousand, one hundred; or twenty-one hundred 9、2,500 = two thousand, five hundred; or twenty-five hundred
