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15 inches X 40 inches = 600 square inches.
Learning how to factor, and/or multiply by basic prime numbers, and/or multiply by 10 will allow you to perform simple figuring such as the following: 15X40=15X4X10=15X2X2X10=30X2X10=60X10=600.
Your figuring may also be thought of without the use of symbols: 15 doubled twice with 1 more zero at the end.
Keep in mind that you must say square as a result of every multiplication problem before the measurement name, because if you don't then you would be giving the measurement of distance instead of a space. Also; be cautious of the fact that 600 square inches is very different from 600 inches squared, and would probably be marked as incorrect if the incorrect answer was written.
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How many cubic inches in a 13 inch wide x 17 inch long cylinder?
2,256.38 cubic inches.
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It is: 21*96 = 2016 square inches
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That is not a square, it is a rectangle and it has a perimeter of 36 inches.
How many yards of 44 inch wide fabric does it take to cover 1 acre of land?
1 yard = 36 inches144 square inches = 1 square foot1 acre = 43,560 square feet1 yard of 44-inches-wide = (36 x 44) = 1,584 square inches = 11 square feet1 acre/11 square feet = 3,960 yards of 44-inch-wide strip.
