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2. Is 23 a prime number?

Yes

No

23 is prime. It has no factors other than itself and 1.

Explanation

23 is prime. It has no factors other than itself and 1.

3. Which is the prime factorization of 30?

2 x 3 x 3

2 x 5 x 5

2 x 3 x 5

3 x 3 x 5

4. All even numbers are multiples of 2.

True

False

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6. Is 35 a prime number?

Yes

No

35 is not a prime number since 35 = 5*7. 35 is divisible by 5 and 7.

Explanation

35 is not a prime number since 35 = 5*7. 35 is divisible by 5 and 7.

7. Which the is the prime factorization of 44?

4 x 11

2 x 2 x 11

2 x 3 x 2 x 5

4 x 2 x 3

8. All odd numbers are prime numbers.

True

False

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11. Select all the numbers that are prime numbers.

7

21

13

10

7 and 13 are prime.
21 = 7*3 and 10 = 2*5 are not prime.

Explanation

7 and 13 are prime.
21 = 7*3 and 10 = 2*5 are not prime.

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14. A class of 36 is on a field trip at the zoo. The teacher wants to break the class into groups of the same size. Find all the possible group sizes by writing all the factors of 36.

1

2

3

4

5

6

7

8

9

10

11

12

14

16

18

20

24

36

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G3t3 Studyhelper 01

1. What is the only even pime number?

2.

What first name or nickname would you like us to use?

2. Is 23 a prime number?

3. Which is the prime factorization of 30?

4. All even numbers are multiples of 2.

5. A _____ number is a natural number that's not a prime number.

6. Is 35 a prime number?

7. Which the is the prime factorization of 44?

8. All odd numbers are prime numbers.

9. What is the sum of the greatest 1-digit prime number and zero?

10. What is the difference of 20 and the least 2-digit prime number?

11. Select all the numbers that are prime numbers.

12. What is the sum of all the prime numbers from 1-10?

13. The year 2013 is the year of the water snake. Is 2013 prime or composite?

14. A class of 36 is on a field trip at the zoo. The teacher wants to break the class into groups of the same size. Find all the possible group sizes by writing all the factors of 36.