表示数目多少或顺序先后的词叫做数词(numeral)。数词与不定式代词很相似，其用法相当于名词与形容词。
数词有两种。表示数目多少的数词叫做基数词(cardinal numeral)，如 one，ten，fifty-two等。表示顺序先后的数词叫做序数词(ordinal numeral)，如 first，tenth，fiftieth等。
1)1-12的基数词是：
one 1, two 2, three 3, four 4, five 5, six 6, seven 7, eight 8, nine 9, ten 10, eleven 11, twelve 12.
13-19，皆由3-9加后缀-teen构成，即：
thirteen 13, fourteen 14, fifteen 15, sixteen 16, seventeen 17, eighteen 18, nineteen 19. (注意thirteen，fifteen，eighteen的拼法)
20-90等十位数均由2-9加加后缀-ty构成，即：
twenty 20, thirty 30, forty 40, fifty 50, sixty 60, seventy 70, eighty 80, ninety 90.
21-29由十位数20加个位数1-9构成，中间须有连字符“-”，即：
twenty-one 21, twenty-two 22, twenty-three 23, twenty-four 24, twenty-five 25, twenty-six 26, twenty-seven 27, twenty-eight 28, twenty-nine 29.
其它的十位数照些类推，如：
thirty-one 31, forty- two 42, fifty-three 53, sixty- four 64, seventy-five 75, eighty-six 86, ninety-seven 97.
2)百位数由1-9加hundred构成，如包含十位数及个位数，中间用and连接，也可以不用;如只包含个位数，即十位数为零时，则and不可省。如：
a (one) hundred 100
two hundred 200
three hundred 300
seven hundred and six 706
a (one) hundred (and) twenty-five 125
three hundred (and) forty-one 341
nine hundred (and) eighty-seven 987
twelve hundred 1200 (英语中从1100-1900之间的整数常用hundred表示)
3)千位数由1-9加thousand构成，其后的百、十、个位数构成方法同前。如：
a (one) thousand 1000
two thousand 2000
three thousand 3000
five thousand six hundred 5600
six thousand eight hundred 6800
a (one) thousand one hundred (and) forty-nine 1149 (此处hundred之前不可用a )
three thousand five hundred (and) thirty-seven 3537
英语里没有“万”这一单位，万也用thousand表示。如：
ten thousand 10 000
twenty thousand 20 000
thirty thousand 30 000
ten thousand one hundred 10 100
twenty thousand two hundred (and) thirty 20 230
forty thousand seven hundred (and) eighty-five 40 785
fifty-five thousand four hundred (and) ninety-three 55 493
十万的说法是：
a (one) hundred thousand 100 000
two hundred thousand 200 000
three hundred thousand 300 000
one hundred and one thousand 101 000 (此处thousand之前不可用a )
two hundred twenty thousand 220 000
three hundred forty thousand five hundred 340 500
four hundred sixty-two thousand seven hundred (and) eighty-nine 462 789
4)百万的说法是：
a (one) million 1 000 000
two million 2 000 000
three million 3 000 000
two million three hundred thousand 2 300 000
three million four hundred twenty-one thousand five hundred 3 421 500
four million five hundred thirty-five thousand six hundred (and) fifty-nine 4 535 659
千万及千万以上的说法是：
sixty million 6000万
five hundred million 5亿
eight billion 80亿
thirty billion 3百亿(等于美国英语thirty billion)
a (one) hundred billion 1千亿(等于美国英语a (one) hundred billion)
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