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2-2 Divisibility and Prime and Composite Numbers

2-2 Divisibility and Prime and Composite Numbers. A. Divisibility Rules A number is divisible by 2: if the number ends in a 0, 2, 4, 6 or 8 (even #) 3: if the sum of the digits is divisible by 3

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2-2 Divisibility and Prime and Composite Numbers

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  1. 2-2 Divisibility and Prime and Composite Numbers A. Divisibility Rules A number is divisible by 2: if the number ends in a 0, 2, 4, 6 or 8 (even #) 3: if the sum of the digits is divisible by 3 4: if the number formed by the last two digits is divisible by 4 5: if the ones digit is 0 or 5

  2. Is 4,320 divisible by 2,3,4,5? Circle yes or no and explain. 2: Yes No 3: Yes No 4: Yes No 5: Yes No

  3. A number is divisible by 6: if the number is divisible by both 2 and 3 8: if the number formed by the last three digits is divisible by 8 9: if the sum of the digits is divisible by 9 10: if the ones digit is 0

  4. Is 4,320 divisible by 6,8,9,10? Circle yes or no and explain. 6: Yes No 8: Yes No 9: Yes No 10: Yes No 4,320 is divisible by ________________

  5. B. Prime vs. Composite Numbers (Div. Rules may help here) Prime number: a whole number that only has two factors (1 and itself) Composite number: a whole number that has more than 2 factors Composite 12 = 1 12 2 6 3 4 6 factors Prime 11 = 1 11 2 factors • • • • 1.) Give an example of a prime number. 2.) Give an example of a composite number.

  6. Determine whether each of these #'s is prime or composite. Remember: Div. Rules may help here. a) 24 b) 49 c.) 37 d.) 236 e.) 111

  7. Demonstrate Understanding: 1.) Test 240 for divisibility by 2,3,4,5,6,8 or 9 2.) Determine if 57 is prime or composite. 3.) Determine if 36 is prime or composite.

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