1. DIVISABILITY
RULES
Elementary Math
Third Grade
July 16, 2013
Landyn Mannion

2. Main Menu
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Examples

3. 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.

4. 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.

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.

6. 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.

7. Which number is divisible by 4?
a) 48
b) 31
c) 123
d) 67
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8. Which number is divisible by 5?
a) 49
b) 163
c) 99
d) 125
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9. Which number is divisible by 6?
a) 54
b) 13
c) 73
d) 104
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10. CORRECT! GOOD JOB!
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11. INCORRECT! TRY AGAIN!
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12. 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.

13. Common Strategies
 Factor Trees
 Find the Greatest Common Factor

14. Credits
 http://www.mathgoodies.com/lessons/vol3/divisibility.html
 http://www.basic-mathematics.com/divisibility-rules.html

15. EXIT