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Grade 7 - Mathematics
Word Problems on Cuboid - I

Example:
The length and width of a rectangular metal sheet are 40 cm and 25 cm respectively. Four squares each of side 5 cm are cut and removed from four corners of the sheet, and the remainder is folded to form a cuboid(without the top face). Find the volume.

Solution:

In the given rectangular sheet has length and breadth equal to 40 cm and 25 cm respectively.
If four corner squares of the side 5 cm are removed and rest is folded into a cuboid.
Then the length and width of the cuboid is reduced by twice the side of square.
Therefore the length of the cuboid = 40 - (2 * 5)
= 40 - 10
length (l)= 30 cm.
The width of the cuboid = 25 - (2 * 5)
= 25 - 10
width (b) = 15 cm.
The height of the cuboid itself is equal to the side of the square removed.
Therefore the height of the cuboid = 5 cm.
Hence the volume of the cuboid is V = l * b * h
V = 30 * 15 * 5
Volume = 2250 cubic centimeters.


Directions: Read the above example carefully and answer the following questions. Also make 10 different examples of your own and illustrate each by making cuboids.