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What two numbers multiplies out to -600 and adds up to ten?
In the case I would first write ALL factors of 600 and find the differences. 1x600 2x300 3x200 4x150 5x120 6x100 8x75 10x60 12x50 15x40 20x30 24x25 The one that subtracts to give the answer is -20 and 30
What is the square inch of a 15 inches wide x 40 inches long?
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.
