英语语法:数词的加减乘除
算术式的读法：※加法
1.在口语中的小数目的加法：用and代表“+”号，is或are 代表“=”
号。如：
Five and three is (or are) eight.
5 + 3 = 8
What's seven and eight?
7 + 8 = ?
2.大数目的加法，或在比较正式的场合──用plus代表“+”号，
equals或is代表“?”号。如：
What does Two hundred and thirty-one plus a hundred and
sixty-three equal?
(or: What is Two hundred and thirty-one plus a hundred and
sixty-three?)
231 +163 = ?
※减法
1.在口语中的小数目的减法──可用以下两种方式 ：
方法一：被减数+take away+减数+leaves (or is) +余数
方法二：减数+from+被减数+leaves (or is) +余数
Four from nine leaves (or is) five.
or: Nine take away four leaves (or is) five.
9 - 4 = 5.
2.大数目的减法或在比较正式的场合──用minus代表“-” 号，
equals代表“?”号。如：
Four hundred and thirty-one minus a hundred and sixty-three
equals two hundred and sixty-eight, right or wrong?
431 - 163 = 268
※乘法
1.口语中小数目的乘法──第二个数目用复数形，等号用are 表示。
如：
What are three tens?
3 x 10 = ?
Five eights are forty.
5 x 8 = 40
2.大数目的乘法用times代表“x ”号，is或makes代表“=”号;在比较
正式的场合用multiplied by代表“x ;”号，equals代表“?”号。如：
What does fifteen times two hundred and sixty-nine make?
(or : What is fifteen times two hundred and sixty-nine?)
15 x 269 = ?
15 x 289 = 4335
15 multiplied by 289 equals 4335.
※除法
1.小数目的除法有两种方式：
方法一：用divided by 代表除号，equals代表“?”号。
方法二：除数+into+被除数+goes+余数──用于会话中。
Three into eighteen goes six.
or: Eighteen divided by three equals six.
18 除以3 = 6.
2.大数目的除法同方法一。
What does six hundred and sixty-seven divided by twenty-three
equal?
667 除以23 = ?
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