Divisibility Rules Factors Prime and Composite Numbers

Composite numbers:

• Are always bigger than prime numbers
• Have more than 2 factors
• Have 2 pairs of factors
• Don't have factors

Find the prime number.

• 10
• 9
• 7
• 4

Which list has only prime numbers?

• 2, 3, 4, 5
• 1, 5, 7, 9
• 2, 3, 5, 7
• 2, 4, 6, 8

2 x 2 x 2 is the prime factorization of

• 6
• 12
• 22
• 8

One is

• prime

• composite

• not prime or composite

• the loneliest number

What is the LCM of 3 and 6?

• 3

• 6

• 12

• 15

What is the GCF of 21 and 7?

• 7

• 21

• 3

• 8

Prime Numbers have

• many factors.

• only 3 factors.

• only two factors, itself and 1.

• only 4 factors.

Name the first 8 prime numbers.

• 3, 5, 9,11,13,15,17,19

• 2,3,5,7,11,13,17,19

• 2,3,5,7,9,11,13,17

• 1,2,3,4,5,6,7,8

A number is divisible by 2 if:

• the sum of its digits is divisible by 2.

• it ends in a 0.

• it is an even number (ends in a 0,2,4,6,8)

• it ends in a 0 or 5.