Prime Factorization
16 = 24
Find the GCF by listing factors
6, 15
GCF of 6 and 15 is 3
Find the GCF by the prime factorizations
20, 45
The GCF of 20 and 45 is 5
Find the LCM by listing multiples
4, 6
The LCM of 4 and 6 is 12
What number is called a prime number?
Number that is divisible only by one and itself
Find the prime factorization of 25
25 = 52
Find the GCF by listing factors
27, 45
The GCF of 27 and 45 is 9
Find the GCF by the prime factorization
24, 90
The GCF of 24 and 90 is 6
Find the LCM by listing multiples
4, 14
The LCM of 4 and 14 is 28
Which layer of the Earth is made mostly of granite and basalt?
The crust!
Find the prime factorization of 54
54 = 2 x 33
Find the GCF by listing factors
30, 48
The GCF of 30 and 48 is 6
Find the GCF by the prime factorization
52, 68
The GCF of 52 and 68 is 4
Find the LCM by listing multiples
6, 20
The LCM of 6 and 20 is 60
What is Mrs. Davison’s dog’s name?
Tito
Find the prime factorization of 77
77 = 7 x 11
Find the GCF by listing factors
28, 48, 64
The GCF of 28, 48, and 64 is 4
Find the GCF by the prime factorization
32, 56, 96
The GCF of 32, 56, and 96 is 8
Find the LCM by listing multiples
15, 20
The LCM of 15 and 20 is 60
Which layer of the Earth is mostly made up of liquid nickel and iron?
The outer core
Find the prime factorization of 84
84 = 22 x 3 x 7
Find the GCF by listing factors
42, 70, 84
The GCF of 42, 70, and 84 is 14
Find the GCF by the prime factorization
45, 75, 120
The GCF of 45, 75, and 120 is 15
Find the LCM by listing multiples
12, 28
The LCM of 12 and 28 is 84
Which is longer in the geologic time scale: eras, periods, or eons?
Eons