What is 10 plus negative 40

Ugh...I feel so stupid forgetting to type the negative...

Adding a negative number is basically subtracting the opposite of the negative number.

10+(-40) is the same as 10-40, which is 30

The answer is -30.

Not quite DarkBlaze

10 + - 40 = 10 - 40 = -30       look 10-10 = 0 so 10-40 must be less than 0.