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Divisibility

Divisibility. Rules. First, let’s watch a short video on the rules of divisibility. Discovering Math: Number Theory (Grades 6-8). Discovery Channel School. 2006. unitedstreaming. 22 October 2007 <http://streaming.discoveryeducation.com/>. What is Divisibility ?.

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Divisibility

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  1. Divisibility Rules

  2. First, let’s watch a short video on the rules of divisibility. Discovering Math: Number Theory (Grades 6-8). Discovery Channel School. 2006.unitedstreaming. 22 October 2007<http://streaming.discoveryeducation.com/>

  3. What is Divisibility? Divisibility means that after dividing, there will beNOremainder.

  4. Can you tell by just looking at this number if it is divisible by 2? by 5? by 10? by 3 ? by 9? By 6? The divisibility rules can help YOU !!! 356,821

  5. Divisibility Ruleshelp you learn shortcuts to tell when a number can be divided by another number with NO remainder.

  6. A number is divisible by 2 if the number is even. 18 ÷ 2 = 9 22 ÷ 2 = 11 (Notice that both of these numbers are even.) 21 ÷ 2 = 10 R1 (Not an even number.) Divisibility by 2

  7. Are these numbers divisibleby 2? • 127 (Not an evennumber) • 937 (Not an evennumber) • 4678

  8. Divisibility by 5 • A number is divisible by 5 if it ends in 0 or5. 25 ÷ 5 = 5 23 ÷ 5 = 4 R3

  9. A number is divisible by 10 if it ends in 0. 30 ÷ 10 = 3 340 ÷ 10 = 34 67 ÷ 10 = 6 R7 784 ÷ 10 =78 R4 Divisibility by

  10. Divisibility By:

  11. Divisibility by 3 • A number is divisible by 3 if the sum of the digits is divisible by 3. Is the number 135 divisible by 3? Add the digits: 1 + 3 + 5 = 9 Yes, 135 is divisible by 3 because the sum of the digits is divisible by 3.

  12. A number is divisible by 9 if the sum of its digits is divisible by 9. 369 is divisible by 9 because 3 + 6 + 9 =18 1 + 8 = 9 AND 9 is divisible by 9. Divisibility by

  13. A number is divisible by 6 if it is divisible by both 2 and 3. Is 42 divisible by 6? Is 51 divisible by 6? Divisibility by 6

  14. After All…DIVISIBILITY Rules!!

  15. The End !! Divisibility is Un-frog-getable !!

  16. THE END Content: P. Frye, Oak Grove Elementary School, December 2003 Graphics: Microsoft Clip Gallery AllAboutFrogs.org Frogland

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