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Miscellaneous Elementary Junior High Sum Of Positive Integral Divisors High School |
Multiplying Decreasing Integers By 9 Minus 1:A. There is a pattern that develops when multiplying decreasing consecutive integers by 9: 1. This method works, only if you are multiplying decreasing consecutive integers by 9 (the last number MUST end in 1) and then subtracting 1. 2. Subtract 1 from the first digit and write it down. Next, write the same number of 8's as in the number being multiplied. Ex [1] 4321 x 9 - 1 = __________. a. 4 - 1 = 3. Write 3. b. Since there are 4 digits we write 4 8's. c. The answer is 38888. Ex [2] 7654321 x 9 - 1 = __________. a. 7 - 1 = 6. b. Since there are 7 digits we write 7 8's. c. The answer is 688888888. B. As in the Multiplying By 9 (#1), be careful and make sure the question is subtracting 1 on the end.
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