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）
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