Download - Chapter 2
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Chapter 2
Section 2.1
Divisibility Rules
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Rule for 2•If the number ends with an even digit
(like 2,4,6,8,0),
then it is divisible by 2. •Example: 1,354,908
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Rule for 5• If the number ends with a digit of “5” or “0”,
then the number is divisible by 5.
•Example: 3,627,905
8,394,410
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Rule for 10•If the number ends in a “0” digit,
Then the number is divisible by 10.
Example: 750,230
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Rule for 3• If you add up the digits of the number and the total is divisible
by 3,
Then the original number is divisible by 3.
Example: 1,248 = 1+2+4+8 =15.
15 is divisible by 3, therefore
so is 1,248!
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Rule for 9• If you add up the digits ofthe number and the total is divisible by 9,
Then the original number is divisible by 9.
Example: 6,543 = 6+5+4+3 =18.
18 is divisible by 9, therefore
so is 6,543.
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Rule for 4• If the last two digits in the number are divisible by 4,
Then the original number is divisible by 4.
Example: 358,912
12 is divisible by 4, therefore so is 358,912!
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Rule for 6• If the number is divisible by 2
and 3,
then it is also divisible by 6.
Example: 8,346.
8,346 = last digit even (divisible by 2)
8,346 = 8+3+4+6 = 21 (divisible by 3)
So also divisible by 6!