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Mathematics 10 Online
OpenStudy (anonymous):

7. Tough Multiplication If you have a large number to multiply and one of the numbers is even, you can easily subdivide to get to the answer: 32 x 125, is the same as: 16 x 250 is the same as: 8 x 500 is the same as: 4 x 1000 = 4,000

OpenStudy (anonymous):

multiplication = fast addition

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