Unit Review: Factors, multiples & primes

C.1Use the divisibility rules for 2, 3, 4, 5, 6, 9, and 10. When asked which divide a number, list all of them.

1. 1
   Is 793 divisible by 4? 
2. 2
   Is 407 divisible by 6? 

C.2Write prime or composite.

1. 3
   Is 177 prime or composite?
2. 4
   Is 156 prime or composite?

C.3List the factors from least to greatest.

1. 5
   List all the factors of 114.
2. 6
   List all the factors of 39.

C.4List all the factor pairs.

1. 7
   List all the factor pairs of 145.
2. 8
   List all the factor pairs of 125.

C.5Write each number as a product of prime numbers.

1. 9
   Write the prime factorization of 176.
2. 10
   Write the prime factorization of 57.

C.6Write each prime factorization using exponents.

1. 11
   Write the prime factorization of 124 using exponents.
2. 12
   Write the prime factorization of 100 using exponents.

C.7Find each GCF.

1. 13
   Find the greatest common factor (GCF) of 13 and 65.
2. 14
   Find the greatest common factor (GCF) of 15 and 90.

C.8Find each GCF. (continued)

1. 15
   Find the greatest common factor (GCF) of 66, 48, and 18.
2. 16
   Find the greatest common factor (GCF) of 88, 77, and 55.

C.9C.10Find each LCM.

1. 17
   Find the least common multiple (LCM) of 3 and 6.
2. 18
   Find the least common multiple (LCM) of 5 and 8.
3. 19
   Find the least common multiple (LCM) of 2, 3, and 9.
4. 20
   Find the least common multiple (LCM) of 4, 6, and 8.

C.11Answer each question.

1. 21
   Find the least common multiple (LCM) of 12 and 2.
2. 22
   Find the least common multiple (LCM) of 8 and 10.

C.1Divisibility Rules

1. 1no
2. 2no

C.2Prime or Composite

1. 3composite
2. 4composite

C.3List the Factors

1. 51, 2, 3, 6, 19, 38, 57, 114
2. 61, 3, 13, 39

C.4Factor Pairs

1. 7$1\times 145$, $5\times 29$
2. 8$1\times 125$, $5\times 25$

C.5Prime Factorization

1. 9$2\times 2\times 2\times 2\times 11$
2. 10$3\times 19$

C.6Prime Factorization with Exponents

1. 11$2^2\times 31$
2. 12$2^2\times 5^2$

C.7C.8Find each GCF.

1. 1313
2. 1415
3. 156
4. 1611

C.9Least Common Multiple

1. 176

C.9C.10Find each LCM. (continued)

1. 1840
2. 1918
3. 2024

C.11GCF & LCM

1. 2112
2. 2240