GMAT Math Review: Basic
Last Modified: 2014-06-15
ps. zero is an integer
O x O =
E x O =
O + O =
E + O =
Not 3: digits must add up to a multiple of 3
Not 4: Last two digits must add up to a multiple of 4
Not 5: number must end in a 5 or 0
Not 6: must meet 2 and 3 requirements
Guess for 7
Not 8: must meet 2 and 4 for it to be possible
Not 9: digits must add up to a multiple of 9
2 is a factor of 10
10 is a multiple of 2
note: 0, 1 are not prime numbers
another note: there is no distinguishable pattern of prime numbers
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