Divisibility
Is 390 divisible by
2 3 5 6 9 10
2-yes
3-yes
5-yes
6-yes
9-no
10-yes
What are the factors for 10?
Is 10 prime or composite?
Factors: 1, 2, 5, 10
Composite
Identify the first five multiples of 6
6, 12, 18, 24, 30
Make a factor tree for 36 and then write the prime factorization
Factor Tree: See board
PF = 2*2*3*3
What is the GCF 35 and 45?
GCF = 5
Is 369 divisible by
2 3 5 6 9 10
2-no
3-yes
5-no
6-no
9-yes
10-no
What are the factors for 20?
Is 20 prime or composite?
Factors: 1, 2, 4, 5, 10
Composite
Identify the first five multiples of 9
9, 18, 27, 36, 45
Make a factor tree for 56 and then write the prime factorization
Factor Tree: See board
PF = 2*2*2*7
What is the GCF of 81 and 63?
GCF = 9
Is 1, 674 divisible by
2 3 5 6 9 10
2-yes
3-yes
5-no
6-yes
9-yes
10-no
What are the factors for 23?
Is 23 prime or composite?
Factors: 1, 23
Prime
Identify the first five multiples of 12
12, 24, 36, 48, 60
Make a factor tree for 43 and then write the prime factorization
Factor Tree: See board
PF = 1*43
What is the GCF of 22 and 11?
GCF = 11
Is 12,930 divisible by
2 3 5 6 9 10
2-yes
3-yes
5-yes
6-yes
9-no
10-yes
What are the factors for 36?
Is 36 prime or composite?
Factors: 1, 2, 3, 4, 6, 9, 12, 18, 36
Composite
Identify the first five multiples of 7
7, 14, 21, 28, 35
Make a factor tree for 100 and then write the prime factorization
Factor Tree: See Board
PF = 2*2*5*5
What is the GCF of 8 and 24?
GCF = 8
Is 32,175 divisible by
2 3 5 6 9 10
2-no
3-yes
5-yes
6-no
9-yes
10-no
What are the factors for 24?
Is 24 prime or composite?
Factors: 1, 2, 3, 4, 6, 8, 12, 24
Composite
Identify the first five multiples of 25
25, 50, 75, 100, 125
Make a factor tree for 71 and then write the prime factorization
Factor Tree: See Board
PF = 1*71
What is the GCF of 20 and 23?
GCF = 1