One, two, three, four, five1,2,3,4,5Six, seven, eight, nine, ten6,7,8,9,10Eleven, twelve, thirteen, fourteen, fifteen11,12,13,14,15Sixteen, seventeen, eighteen, nineteen,twenty16,17,18,19,2021 Twenty-one 22 Twenty-two 23 Twenty-three24 Twenty-four 25 Twenty-five26 Twenty-six 27 Twenty-seven28 Twenty-eight 29 Twenty-nine30 Thirty31thirty—one 32 thirty—two 33 thirty—three 34 thirty—four 35 thirty—five 36 thirty—six 37 thirty—seven 38 thirty—eight 39 thirty—nine 40 forty41forty one 42 forty tow 43 forty three 44 forty four 45 forty five 46 forty six 47 forty seven 48 forty eight 49 forty nine擴充套件資料：1、 百位數表示“幾百”用“個位基數詞+hundred”，在百位數與十位數或個位數之間加上and。如：100 a / one hundred 200 two hundred320 three hundred and twenty 502 five hundred and two948 nine hundred and forty-eight 2、千位數以上阿拉伯數字從數字的右端向左端數起，每三位數加一個逗號“，”。從右開始，第一個“，”前的數字後新增 thousand（千），第二個“，”前面的數字後新增 million（百萬）。千位數以上，當百位為0時，百位與十位之間不用加and。如：1,000 a / one thousand 2,000,000 two million2,648 two thousand six hundred and forty-eight16,250,064 sixteen million two hundred and fifty thousand sixty-four3、當hundred, thousand, million前有確切的數字時，不能使用複數形式；當表示不確切數字，如成百、成千上萬、數以百萬計等時，則用複數形式+of表示。如：There are hundreds of students on the playground．操場上有好幾百名學生。