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Mannion power point

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Mannion power point

  1. 1. DIVISABILITY RULES Elementary Math Third Grade July 16, 2013 Landyn Mannion
  2. 2. Main Menu EXIT Content Post Test Examples
  3. 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. 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. 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. 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. 7. Which number is divisible by 4? a) 48 b) 31 c) 123 d) 67 Main Menu
  8. 8. Which number is divisible by 5? a) 49 b) 163 c) 99 d) 125 Main Menu
  9. 9. Which number is divisible by 6? a) 54 b) 13 c) 73 d) 104 Main Menu
  10. 10. CORRECT! GOOD JOB! Back to Question
  11. 11. INCORRECT! TRY AGAIN! TRY AGAIN
  12. 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. 13. Common Strategies  Factor Trees  Find the Greatest Common Factor
  14. 14. Credits  http://www.mathgoodies.com/lessons/vol3/divisibility.html  http://www.basic-mathematics.com/divisibility-rules.html
  15. 15. EXIT

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