Recent content by JMtB03
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J
High School Number minus sum of digits is dividable by 9
I found an answer! I have the explanation in at the bottom of another thread. https://www.physicsforums.com/showthread.php?p=4315410#post4315410 The formula for finding the sum of the digits of a number, x, is...- JMtB03
- Post #9
- Forum: General Math
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J
High School Formula for sum of digits of a number
I got it. About thirty minutes of non-continuous free time and a half sheet of paper gave me this: For any whole number "x": 1 digit: x 2 digits: (\left\lfloor\frac{x}{10}\right\rfloor) + (x -10(\left\lfloor\frac{x}{10}\right\rfloor)) ... After awhile, I realized I could combine like...- JMtB03
- Post #5
- Forum: Linear and Abstract Algebra