数词加减乘除的表示法

　　1. “加”用plus，and或add表示;“等于”用is，make，equal等词表示。

　　2+3=? 可表示为： How much is two plus three?

　　2+3=5

　　Two plus three is five.

　　Two and three is equal to five.

　　Two and three make five.

　　Two added to three equals five.

　　If we add two to/and three, we get five.

　　二加三等于五

　　2. “减”用 minus或 take from表示

　　10-6=?　How much is ten minus six?

　　10-6=4

　　Ten minus six is four.

　　Take six from ten and the remainder is four.

　　Six (taken) from ten is four.

　　十减去六等于四

　　3. “乘”用time(动词)或multiply表示

　　3X4=? How much is three times four?

　　3X4=12

　　Three times four is/are twelve.

　　Multiply three by four，we get twelve.

　　Three multiplied by four makes twelve.

　　三乘以四等于十二

　　4. “除”用divide的过去分词形式表示

　　16÷4=? How much is sixteen divided by four?

　　16÷4=4

　　Sixteen divided by four is four.

　　Sixteen divided by four equals/gives/makes four.

　　十六除以四等于四。

　　五、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)