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Miscellaneous Elementary Junior High Sum Of Positive Integral Divisors High School |
Multiplying Consecutive Integers By 9:A. There is a pattern that develops when multiplying consecutive integers by 9: 1. If you are multiplying consecutive increasing integers by 9 (the numbers MUST start with 1) and adding the next consecutive number, then use the following: a. Write the same number of 1's as the number that is being added. Ex [1] 1234 x 9 + 5 = __________. a. In this example we simply write 5 1's. b. The answer is 11111. Ex [2] 123456 * 9 + 7 = __________. a. In this example we write 7 1's. b. The answer is 1111111. 2. Sometimes the problem will try to trick you by adding something other than the next digit. Ex [3] 12345 x 9 + 4 = __________. a. Normally, the last number should be 6 but since it is 4, we must subtract 2. b. So the answer is 111111 - 2 or 111109. c. The answer is 111109. |
