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Divisibility Rules Worksheet
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Divisibility Rules
By Janine Bouyssounouse
The divisibility rules make math easier
. Did you ever wonder how people
could tell if something was divisible by a number just by looking at it?
These rules are how they do it. Memorize a few simple rules and simplifying
fractions and prime factorization will be so much easier.
Number
Divisibility Rule
Example
Two (2)
A number is divisible by two if it is
even
. Another way to say a word is
even is to say it ends in 0, 2, 4, 6 or 8.
642 is divisible by two
because it ends in a
two, which makes it an
even number
Three
(3)
A number is divisible by three if the
sum of the digits adds up to a
multiple of three
.
423 is divisible by three
because 4 + 2 + 3 = 9.
Since nine is a multiple
of three (or is divisible
by three), then 423 is
divisible by three
Four (4)
A number is divisible by four if it is
even and
can be divided by two twice
.
128 is divisible by four
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This note was uploaded on 04/19/2011 for the course MTH 110 taught by Professor Helenius during the Winter '08 term at Grand Valley State University.
 Winter '08
 HELENIUS
 Math

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