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倍数，分数，小数表示法
倍数
He got double（or twice）my pay．
You have paid three times the usual price．（thrice很少用）
You are twice his age．
It is worth twice the value．
This house is ten times bigger than（or ten times as big as）that one．
This is as long again（or twice as long）as that．
This is half as long again as（or one and a half times longer than）that．
The price doubled（or tripled）in ten years（or between 1978 and 1988）．
Between 1979 and 1988 the output of coal rose by 250％．
Rice production in this year dropped 25 percent（or grew 1．3－fold）．
Three times five is（or are）fifteen．Three multiplied by five is fifteen．
He did it once or twice（or twice or thrice，two or three times）（=occasionally）．
Think twice（＝Think and think again）before you act．
分数
1/2：half—half a day，half the distance，half your weight
1/3：a third—a third of a second，a third of the apple，a third of the trouble
1/4：a quarter—a quarter of a mile，a quarter of the cost
1/8：one eighth—one eighth of the area，one eighth the area
3/7：three sevenths—three sevenths of the population，three sevenths the population，three sevenths of a mile
58/94：fifty-eight ninety-fourths，fifty-eight over nine-ty-four
5/100：5％，five percent，five per cent—five percent dis-count
360/820：three hundred sixty over（or by）eight hundred twenty
a quarter
He has waited five hours and a half（or five and a half hours）．
Three-tenths of forty is twelve．
This is half copper and half silver．
Let's divide it fifty-fifty（=equally）．
Let's cut the cake in half（or in halves，into halves，in two）．
小数
16．104：sixteen point（or decimal）one o four．（在多数欧洲国家，可用逗号代替小数点。）
0.32：nought（or zero）point three two．（写出时最好加o，在口语中nought或zero可以省略。）
8，765.643 286 733 37：（如果小数点后有许多位数，每三位数后可留一个空，而不宜加逗号。）