What is the volume of this rectangular prism?

3ft by 6 1/4 ft by 14 ft

We can find the volume of any rectangular prism by simply multiplicating its height, length and width.

Also, lets change that 6 1/4 to 6.25, or 25/4 if you like. I'm gonna use 6.25.

If we take volume as "V", then:

V = L * W * H

V = 3ft * 6.25ft * 14ft

V = 262.5 ft^3 (Its ft cubed because we multiplied by ft three times.)