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Rules of Divisibility

Rules of Divisibility
by

Shannon R

on 5 January 2013

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Transcript of Rules of Divisibility

Rules of Divisibility Homework The following rules help you determine which numbers are divisible by 2, 3, 4, 5, 6, 9, and 10.

"Divisible by" means you can divide evenly with no remainder. A number is divisible by 2 if it is even (ends in 0, 2, 4, 6, or 8) Divisible by 2 A number is divisible by 6 if it is divisible by 2 AND 3. Divisible by 6 A number is divisible by 9 if the sum of the number's digits is divisible by 9. Divisible by 9 Make sure you copied down each rule of divisibility.

Tomorrow you will be working with your row partner on a worksheet using these rules. Divisible by 3 A number is divisible by 3 if the sum of its digits is divisible by 3. Divisible by 10 A number is divisible by 10 if it ends in a zero. 24 is divisble by 2 because it ends in a 4.

128 is divisible by 2 because it ends in an 8. Divisible by 4 A number is divisible by 4 if its last two digits are a number that is divisible by 4. Divisible by 5 123 is divisible by 3 because 1+2+3=6 and 6 is divisible by 3.

81 is divisible by by 9 because 8+1=9 and 9 is divisible by 3. 232 is divisible by 4 because 32 is divisible by 4.

104 is divisible by 4 because 04 is divisible by 4. A number is divisible by 5 if it ends in 5 or 0. 25 and 160 are both divisible by 5 because they end in a 5 or 0. 24 is divisible by 6 because it is divisible by 2 (ends in a 4) and it is divisible by 3 (2+4=6 which is divisible by 3). 234 is divisible by 9 because 2+3+4=9 and 9 is divisible by 9.

981 is divisible by 9 because 9+8+1=18 and 18 is divisible by 9. 20 and 2030 are both divisible by 10 because they both end in a zerio.
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