"-30"怎么读的。

minus thirty

minus thirty

minus 30

negative thirty

-30 is minus thirty. If it is -30c (temperature)it is common to say 30 below, or 30 degrees below 0. You could also say negative thirty, but minus thirty is better.

Below 0 = Negative Above Zero = Positive

- = minus
+ = plus
* = times
/ = divide
= = equals
e.g. 5 * 5 five times give