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DIVISABILITY
RULES
Elementary Math
Third Grade
July 16, 2013
Landyn Mannion
Main Menu
EXIT
Content
Post Test
Examples
Content 1.1
A number is
divisible by 2 if it
ends in
0, 2, 4, 6, or 8.
A number is
divisible by 3 if
the sum of its
digits is
divisible by 3.
Content 1.2
A number is divisible
by 4 if its last two
digits are divisible
by 4.
A number is
divisible by 5 if it
ends in 0 or 5.
Content 1.3
A number is
divisible by 6 if
it is divisible by
both 2 and 3.
A number is
divisible by 8 if
the last three
digits are
divisible by 8.
Content 1.4
A number is
divisible by 9 if the
sum of its digits is
divisible by 9.
A number is
divisible by 10 if
it ends in 0.
Which number is divisible by 4?
a) 48
b) 31
c) 123
d) 67
Main Menu
Which number is divisible by 5?
a) 49
b) 163
c) 99
d) 125
Main Menu
Which number is divisible by 6?
a) 54
b) 13
c) 73
d) 104
Main Menu
CORRECT! GOOD JOB!
Back to
Question
INCORRECT! TRY AGAIN!
TRY AGAIN
EXAMPLE & REASONING
• 2 is not a factor because the last digit (1) is not even.
• 3 is not a factor because the sum of the digits (3 + 1 = 4) is not
divisible by 3.
• 4 is not a factor because the number formed by the last two digits
(31) is not divisible by 4.
• 5 is not a factor because the last digit (1) is not 0 or 5.
• 6 is not a factor because the number is not divisible by 2 and 3.
• 9 is not a factor because the sum of the digits (3 + 1 = 4) is not
divisible by 9.
• 10 is not a factor because the last digit (1) is not 0.
Common Strategies
 Factor Trees
 Find the Greatest Common Factor
Credits
 http://www.mathgoodies.com/lessons/vol3/divisibility.html
 http://www.basic-mathematics.com/divisibility-rules.html
EXIT

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