同學(xué)們讀了這篇文章，會感到用英語表示四則運(yùn)算并不難。大家學(xué)了以后，可以自己練習(xí)，也可以兩人互練。

四則運(yùn)算包括加法、減法、乘法和除法。“做算術(shù)”是do sums.

1. 加法 (addition) 與加法相關(guān)的詞匯有：加數(shù)(addend)， 加號(plus sign/plus) 與和數(shù)/和(sum)。表示“加”，可以用動詞add，介詞plus，和連詞and。常見的表達(dá)方法有：

1) 8+2 = ? 八加二得/等于多少？

a. What' s eight plus two?

b. How much is eight plus two?

2) 8 + 2 = 10 八加二得/等于十。

a. Eight plus two is/makes ten.

b. Eight and two is/makes ten.

c. Eight plus two is equal to ten.

d. Eight plus two equals ten.

e. If you add eight and/to two， you get ten.

f. Add eight and/to two， and you' 11 get ten.

3) 8 + 2 = ? 八加二的和是多少？

What' s the sum of eight and two?

4) 8+2= 10 八加二的和為十。

The sum of eight and two is ten.

5)那里需要有個加號。

You need a plus sign/plus there.

6)那里應(yīng)該有個加號。

There should be a plus sign/plus there.

2. 減法 (subtraction) 與減法相關(guān)的詞匯有：減數(shù) (subtrahend). 減號 (minus sign/minus)與數(shù)/差(difference)。 表示“減”，可以用動詞subtract... from， 和介詞minus， from。常見的表達(dá)方法有：

1) 8-2=?八減二得／等于多少？

a. What' s eight minus two?

b. How much is eight minus two?

2) 8 - 2=6 八減二得/等于/剩/余六。

a. Eight minus two is/makes six.

b. Two subtracted from eight is six.

c. Two from eight is six.

d. Eight minus two is equal to six.

e. Eight minus two equals/leaves six.

f. If you subtract two from eight， you get six.

g. Subtract two from eight， and you' 11 get six.

3) 8 - 2 = ? 八減二的差是多少？

What's the difference between eight and two?

4) 8 - 2 = 6 八減二的差是六。

The difference between eight and two is six.

5)那里需要有個減號。

You need a minus sign/minus there.

6)那里應(yīng)該有個減號。

There should be a minus sign/minus there.

3. 乘法（multiplication）與乘法相關(guān)的詞匯有：乘數(shù)(multiplier)、乘號(muitiplication sign)與乘積/積(product)。表示“乘以”，可以用動詞multiply... by， 和介詞by， times。常見的表達(dá)方法有：

1) 8×2=?八乘以二得／等于多少？

a. What' s eight by two'?

b. How much is eight by two？

2） 8×2 = 16 八乘以二得/等于十六。

a. Eight by two is/makes sixteen.

b. Eight times two is/makes sixteen.

c. Eight times two is equal to sixteen.

d. Eight times two equals sixteen.

e. Eight times two， that' s sixteen.

f. Eight muhiplied by two is sixteen.

g. Eight multiplied by two is equal to sixteen.

h. Eight multiplied by two equals sixteen.

i. Ifyou multiply eight by two， you get sixteen.

j. Multiply eight by two， and you'll get sixteen.

３）8×2=?八乘以二的積是多少？

What' s the product of eight and two?

4)8×2=16八乘以二的積是十六。

The product of eight and two is sixteen.

4. 除法(division) 與除法相關(guān)的詞匯有：除數(shù) (divisor)， 除號(division sign) 與商數(shù)/商(quotient)。表示“除以”，可以用動詞divide...by; 表示“以……除 ”， 可以用動詞divide...into， go...into。常見的表達(dá)方法有:

1) 8÷2 = ? 八除以二得/等于多少？

a. What' s eight divided by two?

b. How much is eight divided by two?

2) 8÷2 =4 八除以二得/等于四。

a. Eight divided by two is/makes four.

b. Eight divided by two is equal to four.

c. Eight divided by two equals four.

d. If you divide eight by two， you get four.

e. Divide eight by two， and you' 11 get four.

3) 8÷2 = ? 以二除八得多少？

a. What' s two dividing into eight?

b. What' s two into eight?

4) 8÷2 = 4以二除八得四。

a. Two divides into eight four times.

b. If you divide two into eight， you get four.

c. Divide two into eight， and you' 11 get four.

d. Two goes into eight four times.

5) 8÷2=? 八除以二的商是多少？

What' s the quotient of eight divided by two?

6) 8 ÷2 = 4八除以二的商是四。

The quotient of eight divided by two is four.

7)以3除10。除不盡。

Three into ten won' t go.

8）任何奇數(shù)都不能被2除盡。

Any odd number is indivisible by two.