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Math 01
Divisibility
Question | Answer |
---|---|
Divisible by 3 | Sum |
Divisible by 4 | Last 2 digits |
Divisible by 6 | Even & /3 |
Divisible by 7 | Last digit x 2 minus rest of digits |
Divisible by 8 | Last 3 digits |
Divisible by 9 | Sum |
b**m x b**n = | b**m + n |
b**m / b**n = | b**m-n |
b**0 | 1 |
b**1 | b |