H_div_rules - DIVISIBILITY RULES AND PRIME FACTORIZATION 2(Prime A number is divisible by 2 if its last digit is 0 2 4 6 or 8 Any even number is

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VC DEPARTMENT OF MATHEMATICS REVISED FALL 2005 DIVISIBILITY RULES AND PRIME FACTORIZATION 2 (Prime) A number is divisible by 2 if its last digit is 0, 2, 4, 6, or 8. Any even number is divisible by 2. 3 (Prime) Add all of the digits composing the number. If the sum of the digits is divisible by 3, then so is the original number. Example : If the number is 564, add 5 + 6 + 4 = 15 . The sum of the digits (15 ) is divisible by 3, so 564 is also divisible by 3. 4 (Composite) A number is divisible by 4 if the number formed by its last two digits is divisible by 4, or if the number ends in 00. Examples : The number 5748 is divisible by 4 because the number formed by its last two digits (48 ) is divisible by 4. The number 300 is divisible by 4 because it ends in 00 . 5 (Prime) A number is divisible by 5 if its last digit is 0 or 5. 6 (Composite) A number is divisible by 6 if it is divisible by both 2 and 3 (see above). 7 (Prime)
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This note was uploaded on 01/17/2012 for the course MATH V04 taught by Professor Michaelbowen during the Spring '12 term at Ventura College.

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