A right rectangular prism has edges of 2 1/4 in, 1 1/2 in and 1 1/2 in. How many cubes with lengths of 1/4 in would be needed to fill the prism? What is the volume?
1 answer:
The volume of a rectangular prism is (length) x (width) x (height). The volume of the big one is (2.25) x (1.5) x (1.5) = <em>5.0625 cubic inches</em> . The volume of the little one is (0.25)x(0.25)x(0.25)= 0.015625 cubic inch The number of little ones needed to fill the big one is (Volume of the big one) divided by (volume of the little one) . 5.0625 / 0.015625 = <em>324 tiny cubies</em> ================================================= Doing it with fractions instead of decimals: The volume of a rectangular prism is (length) x (width) x (height). Dimensions of the big one are: 2-1/4 = 9/4 1-1/2 = 3/2 1-1/2 = 3/2 Volume = (9/4) x (3/2) x (3/2) = (9 x 3 x 3) / (4 x 2 x 2) = 81 / 16 cubic inches. As a mixed number: 81/16 = <em>5-1/16 cubic inches</em> Volume of the tiny cubie = (1/4) x (1/4) x (1/4) = 1/64 cubic inch. The number of little ones needed to fill the big one is (Volume of the big one) divided by (volume of the little one) . (81/16) divided by (1/64) = (81/16) times (64/1) = 5,184/16 = <em>324 tiny cubies</em> .
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