- 加：add
- 减：subtract
- 乘：multiply
- 除：divide
- 等于：equal
但在算式中的时候，得用：
- 加：plus 或者 and
- 减：minus 或者 negative
- 乘：times 或者 multiplied by
- 除：divided by
- 等于：equals 或者 is
“Plus”和“and”都可以用来表示加法。但“Plus”更常见。在比较随意的情况下，可以用“is”指代“equals”。”
例句：
2 1=3：2 plus 1 is 3
2-1=1：2 minus 1 is 1
2×1=2：2 times 1 is 2
2÷1=2：2 divided by 1 is 2
加法例句：
How much is 1 plus 2?
1加2等于多少?
What is 1 plus 2? (more common)
1加2是多少?(更常见)
1 2 = 3 (One plus two equals three.)
1 2 = 3 (One plus two is three.)
1 2 = 3 (One and two is three.)
减法例句：
What is 8 minus 2?
8减2等于多少?
8-2 = 6 (Eight minus two equals six.)
8-2 = 6 (Eight minus two is six.)
乘法例句：
What is 7 times 3?
7乘以3等于多少?
7 x 3 = 21 (Seven times three equals twenty-one.)
7 x 3 = 21 (Seven multiplied by three equals twenty-one.)
除法例句：
What is 6 divided by 2?
6除以2等于多少?
6 / 2 = 3 (Six divided by two is three. )
内容参考：
http://www.englishnumber.com/math-equations/how-to-pronounce-math-equations.html
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