Math Basics Flashcards

Terms Definitions
An integer is divisible by 3 if...
the SUM of the integer's DIGITS is divisible by 3
An integer is divisible by 4 if...
the integer is divisible by 2 TWICE, or if the LAST TWO digits are divisible by 4
(*** Take the last two digits, divide it by 2 TWICE)
An integer is divisible by 5 if...
the integer ends in 0 or 5
An integer is divisible by 6 if...
the integer is divisible by BOTH 2 and 3
An integer is divisible by 8 if...
the integer is divisible by 2 THREE TIMES or if the LAST THREE digits are divisible by 8
An integer is divisible by 9 if...
the SUM of the integer's DIGITS is divisible by 9
What is a factor (divisor)?
a factor is a positive integer that divides evenly into an integer
If you add or subtract multiples of N, the result is...
a multiple of N
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