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)