Illustrated · 1 min
Ok, so let's say that we have a prism like below:
and the volume of it was 16 cm cubed, and then we have this prism: I know they look the same)
who's volume is 45 cm cubed.
To find out the difference in volume, we just subtract the numbers and take the absolute value of it. This is the same for adding volume, only you don't have to take the absolute value of the answer.
Hope that made sense!