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） 本文来源：https://www.wddqw.com/doc/29d5524f834d2b160b4e767f5acfa1c7ab00825f.html