一、英语基数词百位数的写法, 它的规律是:个数基数词形式加“hundred”,表示几百,在几十几与百位间加上and.例如:
101 a hundred and one
320 three hundred and twenty
648 six hundred and forty eight
523 five hundred and twenty three
325 three hundred and twenty five
428 four hundred and twenty eight
102 one hundred and two
999 nine hundred and ninety nine.

二、分数表示法
1. 分数是由基数词和序数词一起来表示的。基数词作分子,序数词作分母,除了分子是“1”以外,其它情况下序数词都要用复数形式。
3/4 three fourths或 three quarters
1/3 one third或a third
24/25 twenty-four twenty-fifths
3 1/4 three and one fourth或 three and one quarter
1/2 a half
1/4 one quarter或a quarter
1 1/2 one and a half
1 1/4 one and a quarter
2. 当分数后面接名词时,如果分数表示的值大于1,名词用复数;小于1,名词用单数。
1 1/2 hours 一个半小时(读作 one and a half hours)
2 3/4 meters 二又四分之三米(读作two and three-fourths meters)
4/5 meter 五分之四米
5/6 inch 六分之五英寸
3. 表示“n次方”的说法:指数用序数词,底数用基数词。
10的7次方 the seventh power of ten(ten to the seventh power)
6的10次方 the tenth power of six(six to the tenth power)