加

+ plus
e.g. 1 + 1 = 2 one plus one equals two

减

- minus
e.g. 2 - 1 = 1 two minus one equals one

乘

x multiplied by
x times
e.g. 2 x 2 = 4 two times two equals four

除

÷ divided by
e.g. 10 ÷ 2 = 5 ten divided by two equals five

幂

二次方 squared
三次方 cubed
n 次方 to the power of n

等

= euals
= is equal to
≈ is approximately equal to
≠ is not equal to

比较

< is less than
<= is less than or equal to
> is greater than
>= is greater than or equal to

其它

无限 infinity
% percent
阶乘！factorial