Factors and Prime Factorisation

A prime number...

• has one factor.
• has more than 2 factors.
• has 100 factors.
• has exactly 2 factors: 1 and the itself.

A composite number ...

• has more than 2 factors.
• has one factor.
• has at least 10 factors.
• is always a really big number.

What are the prime factors of 27?

• 3x3x3

• 3x2x3

• 3x3x4

Find the prime factors of 45.

• 5x9

• 3x15

• 3x3x5

What are the prime factors of 90?

• 3x3x4x5

• 5x5x3

• 2x3x3x5

Use a number tree to find the prime factorization of 32

• 2 x 2 x 2 x 3

• 2 x 2 x 2 x 2 x 2

Which are the factors of 14?

• (1,14)

• (1, 2, 7, 14)

• (2, 7)

Which are the factors of 24?

• (1, 2, 3, 8, 12, 24)

• (2, 3, 4, 6, 8, 12)

• (1, 2, 3, 4, 6, 8, 12, 24)

which number below is NOT prime?

• 7
• 9
• 2
• 3

Find the prime number.

• 10
• 9
• 7
• 4