Rules of divisibility


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Rules of divisibility

  1. 1. Wednesday, August 10th<br /><ul><li>Turn in Einstein of the Month on the top bin
  2. 2. Grab a warm up sheet from me
  3. 3. Write down HOMEWORK</li></li></ul><li>Warm Up<br />Write each number as a product of two whole numbers in as many ways as possible.<br />1. 24 2. 7<br />
  4. 4. Joke of the Day<br />What did the pencil say to the other pencil?<br />“You’re looking sharp”<br />
  5. 5. What to Expect an Accelerated Math<br />Syllabus must be signed by Friday!<br />
  6. 6. Question of the Day<br />How can we describe the differences in today’s two warm up numbers?<br />
  7. 7. By the end of the day…..<br />1,407 or 2,303 <br />Which one is primeand why<br />
  8. 8. What is divisibility?!?!<br />Example 1: Let’s say….3 brothers bought a pack of 24 baseball cards to share.<br />Can they each get the same number of cards? How do you know?<br />Example 2: Five friends decide to order a pizza. If the pizza is cut into 8 slices. <br />will they each be able to get the same number of<br />slices without any pizza left over?How do you know?<br />
  9. 9. Table of Contents<br />Date: 8/10<br />Section 4-1<br />Title: Divisibility, Prime, & Composite<br />Page: 1 - 4 <br />
  10. 10. Vocab word #1 DIVISIBILITY<br />How would you Define it?<br />Ms. Evans: a number is divisible by another if you can divide it and the quotient is a whole number<br />
  11. 11. Rules of Divisibility<br />
  12. 12. You try!<br />Tell whether 462 is divisible by 2, 3, 4, and 5<br />The last digit, 2, is even.<br />Divisible<br />The sum of the digits is 4 + 6 + 2 = 12. 12 is divisible by 3.<br />Divisible<br />Not divisible<br />The last two digits form the number 62. 62 is not divisible by 4.<br />Not divisible<br />The last digit is 2.<br />So 462 is divisible by 2 and 3.<br />
  13. 13. You try!<br />Tell whether 540 is divisible by 6, 9, and 10<br />The number is divisible by both 2 and 3.<br />Divisible<br />The sum of the digits is 5 + 4 + 0 = 9. 9 is divisible by 9.<br />Divisible<br />The last digit is 0.<br />Divisible<br />So 540 is divisible by 6, 9, and 10<br />
  14. 14. Finding the Missing Digit<br />Create a number that is divisible by 2 AND 5 32,07__<br />Create a number that is divisible by 4 and 6 <br />26,95____<br />Create a number that is divisible by 8 and 9<br />123,98______<br />Work on this with your groups. When you think you have the answers raise your hand & then help others around you <br />
  15. 15. Snap Cube Discovery page 2<br />At your tables you will find snap cubes, please be respectful of these fun math manipulatives!<br /> Each person will complete the table on the back<br />Let’s do 1 and 2 together! <br />
  16. 16. Discussion<br />For which numbers can you<br />make only one array? <br />These are ourprime<br />For instance, 3 is prime since only one array can be made <br />For which numbers can you<br />make more than 1 array? <br />These are our composite<br />For instance, 4 is composite<br />since more than one array can be made.<br />
  17. 17. What about 1 and 2??<br />1 is it prime or composite?<br />2 is it prime or composite?<br />
  18. 18. Sieve of Erathosthenes page 3<br />Complete<br />When done raise your hand! <br />Help others around you  <br />
  19. 19. Can you answer this now?<br />1,407 or 2,303 <br />Which one is prime? How do you know?<br />