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Fractions
odd nor even
Absolute Value
equal to its distance from 0 on the # line; the absolute value of any # is always +; whether the # itself is positive or negative; symbol is | |
Factors
a # that will divide equally into the # in question; only a few factors of any # (factors of 12 e.g. 1(12), 2(6), 3(4)
Multiples
a number is one that the # itself is a factor of; where are infinite # of multiples for any #; 0 is a multiple of every # (e.g. factor-8, multiples-8, 16, 24, 32, 40)
Prime Numbers
an integer that only has two factors: itself and 1 (e.g. 37: 1(37); Prime #s below 30: 2,3,5,7,11,13,17,19,23,29); 0/1 are not prime, an exception is 2; positive #s, no negative prime #s or a prime fr
Divisibility
a # is always divisible by its factors (e.g. 2 if its unit is divisible by 2; 3 if the sum of its digits is divisible by 3; 4 if its last 2 digits form a # that's divisible by 4; 5 if its units digit
