Download presentation

Presentation is loading. Please wait.

Published byKarin Stafford Modified over 2 years ago

1
PowerPoint created by Parsheena Berch Resource : JBHM material Pictures: Google Images

2
Prime and Composite Number

3
Bell Ringer: Page 33 in JBHM binder (DOK 1)

4
Focus/Introduction: Page 104 Composite Number- a natural number that has more than two factors. Prime Number- a number that has only two factors, 1 and itself.

5
Have you ever heard of a superprime? A superprime is a number that remains prime even after digits are removed from the right side one at a time. Example: 2391: remove 1 and 239 is prime, remove 9 and 23 is prime, remove 3 and 2 is prime.

6
Guided Practice: (DOK 1) What is a composite number? (a number having more than two factors) 8 and 4 are examples of composite numbers. What is a prime number? (a number that has only two factors, 1 and itself; 2, 3, 5, and 17 are examples of prime numbers)

7
Is 1 prime or composite? It is a lonely number because it is neither prime nor composite. It is not a prime number because it does not have exactly two factors, and it is not composite because it does not have more than two factors. So, 1 is not prime or composite.

8
Divisibility Rules: A number is divisible by ___ if… 2 – The number is an even number, ending in 2, 4, 6, 8, 0. Example: 124: It ends in 4, so it is divisible by 2. 124 ÷ 2 = 62

9
Divisibility Rules: A number is divisible by ___ if… 3 – The sum of the digits is divisible by 3. Example: 150: The sum of the digits, 1 + 5 + 0 = 6, is divisible by 3, so 150 is divisible by 3. 150 ÷ 3 = 50

10
Divisibility Rules: A number is divisible by ___ if… 4 – The number is even and the last 2 digits form a number that is divisible by 4. Example: 724: It is even, and the last two digits, 24, is divisible by 4, so 724 is divisible by 4. 724 ÷ 4 = 181

11
Divisibility Rules: A number is divisible by ___ if… 5 – The number ends in 0 or 5. Example: 105: It ends in 5, so 105 is divisible by 5. 105 ÷ 5 = 21

12
Divisibility Rules: A number is divisible by ___ if… 6– The number is even, and the sum of its digits is divisible by 3. Example: 450: It is even and the sum of the digits, 4 + 5 + 0 = 9, is divisible by 3, so 450 is divisible by 6. In other words, if the rule for 2 and the rule for 3 work, the number is divisible by 6. 450 ÷ 6 = 75

13
Divisibility Rules: A number is divisible by ___ if… 7 and 8 – These rules are too complicated to actually be shortcuts.

14
Divisibility Rules: A number is divisible by ___ if… 9 – The sum of the digits is divisible by 9. Example: 450: The sum of the digits, 4 + 5 + 0 = 9, is divisible by 9, so 450 is divisible by 9. 450 ÷ 9 = 50

15
Divisibility Rules: A number is divisible by ___ if… 10 –The number ends in 0. Example: 1250: It ends in 0, so 1250 is divisible by 10. 1250 ÷ 10 = 125

16
Independent Practice/Activities: (DOK 2) Divisibility Practice: Is the first number divisible by the second? Explain “why” or “why not.”

17
1.825; 5___ 2.91; 2___ 3.51; 3____ 4.39; 3___ 5.726; 6___ 6.117; 3____

18
7. 100; 5___ 8. 529; 6___ 9. 40; 10___ 10. 729; 3___ 11. 222; 3___ 12. 309; 9___ 13. 99; 2___ 14. 224; 4___

19
Which of the numbers are prime or composite? (DOK 1) 1.825— 2.17— 3.91— 4.25— 5.51— 6.1— 7.39— 8.29—

20
Closure: Who can explain prime/composite numbers. Homework: List the prime numbers 1—25.

Similar presentations

OK

4-1 Divisibility Warm Up Problem of the Day Lesson Presentation

4-1 Divisibility Warm Up Problem of the Day Lesson Presentation

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on synthesis and degradation of purines and pyrimidines size Ppt on building management system Job based pay ppt online Ppt on area of parallelogram and triangles geometry Ppt on health insurance in india Dentist appt on saturday Ppt on sap r 3 architecture Ppt on immunization schedule Ppt on op amp circuits formula Ppt on chapter 3 atoms and molecules video