LCM, GCF and Prime Factorization

What is the least common multiple of 4 and 5?

• 40
• 60
• 1
• 20

GCF of 99 and 54

• 9
• 3
• 6
• 8

Which is not a factor of 18?

• 7
• 2
• 3
• 9

Tags

CCSS.4.OA.B.4

What is the GCF of 20 and 30?

• 5
• 2
• 10
• 20

Joe has listed the first 4 multiples of 7 as: 
7   14    22     28
Which one is incorrect?

• 7
• 14
• 22
• 28

Use a number tree to find the prime factorization of 48

• 4x2x6
• 4x2²x3
• 3x2⁴
• 12x4

Tags

CCSS.4.OA.B.4

Using a Factor Tree, find the prime factorization of 48 in expanded form. 

• 2 x 12 x 12
• 2 x 2 x 2 x 2 x 3 x 3 x 5
• 2 x 2 x 2 x 2 x 3
• 7 x 7 x 7 

Is 35 prime or composite?

• prime
• composite

Tags

CCSS.4.OA.B.4

Composite numbers:

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

Tags

CCSS.4.OA.B.4

What is the prime factorization of 100? - make a factor tree.

• 2 x 5 x 10

• 2 x 5 x 5

• 4 x 25

• 2 x 2 x 5 x 5