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| If x is divisible by y then Y is...... |
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1) y is a divisor of x.
2) y is a factor of x.
3) x equals ky for some integer k.
4)x is a multiple of y! |
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Sum of all the digits is divisible by 3.
example: 491 = 14 NOT divisible by 3
531= 9 divisible by 3. |
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2-digit # at the end is divisible by 4
412= 12= divisible by 4. |
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| Divisibility rules by 2 & 3. So EVEN and if sum of all digits is divisible by 3 |
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| Sum of all the digits is divisible by 9. |
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2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59
2 is only even prime |
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| y is hiding in the prime factorization of x |
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| Rule for Adding same type of integer together |
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| If integer is BOTH ODD, or BOTH EVEN will always be EVEN!!!!!! |
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| Rule for adding/subtracting to different kinds of integers |
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| When adding or subtracting an ODD and a EVEN or vice versa answer will always be ODD |
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| Rule for multipling with EVEN integers |
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| If multiplication problem has any EVEN in the problem the answer will ALWAYS BE EVEN!!!!!!!! |
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| How many POSITIVE Divisors a number has? |
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1) Find the prime factorization such that p*a x q*b x r*c
2) (a+1)(b+1)(c+1) |
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