How to Find Volume in Cubic Feet

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In math, a cubic foot is a cube whose dimensions are one foot in width, height and depth. Find volume in cubic feet with tips from a math teacher in this free video on solving math problems.

Part of the Video Series: Solving Math Problems
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I'm Nancy E. T. Johnson, mathematics teacher. This is how to find volume in cubic feet. A cubic foot is a cube whose dimensions are one foot in width, one foot in height, and one foot in depth, so if these measurements were in feet, this would represent a cubic foot. It's actually smaller. We ha... The width of this box is about fifteen inches; it's depth is about twelve inches, and the height is ten inches, so we have fifteen, ten, and twelve. Since these are in inches, and we want our calculation to be in cubic feet, we need to change these to feet before we multiply. Fifteen inches is a one foot, and then three twelfths of an inch, so one and three twelfths feet. Ten inches is ten twelfths of a foot. We could simplify that to five sixths of a foot. And twelve inches is exactly one foot. When we're calculating the volume of a rectangular prism like this we multiply width times height times depth; the three measurements. To so to find the volume of this object, we would need to multiply one and three twelfths times five sixths times one. If I change this im, this mixed number to back to fifteen twelfths it will make it easier to multiply, and when you multiply it times one we get the same number. So, fifteen times five is seventy five, and twelve times six gives us seventy two, so it looks like we have seventy two over seventy two would be one; one and three over seventy two cubic feet. So, that's where we're multiplying feet times feet times feet. That's where we're getting the feet to the third power; read as cubic feet. That's how to find volume in cubic feet. I'm Nancy E. T. Johnson, mathematics teacher.

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