Find out whether the first number is a factor of the second number. 4. Find the common factors of the following.

Since the remainder is 0, the first number is a factor of the second number.
Answer: $\boxed{\text{Yes}}$

b) 32, 800

Since the remainder is 0, the first number is a factor of the second number.
Answer: $\boxed{\text{Yes}}$

c) 29, 581

Since the remainder is not 0, the first number is not a factor of the second number.
Answer: $\boxed{\text{No}}$

d) 42, 2772

Since the remainder is 0, the first number is a factor of the second number.
Answer: $\boxed{\text{Yes}}$

4. Find the common factors of the following.

a) 8 and 12

Factors of 8: $1, 2, 4, 8$
Factors of 12: $1, 2, 3, 4, 6, 12$

Answer: $\boxed{1, 2, 4}$

b) 24 and 36

Factors of 24: $1, 2, 3, 4, 6, 8, 12, 24$
Factors of 36: $1, 2, 3, 4, 6, 9, 12, 18, 36$

Answer: $\boxed{1, 2, 3, 4, 6, 12}$

c) 8, 18 and 52

Factors of 8: $1, 2, 4, 8$
Factors of 18: $1, 2, 3, 6, 9, 18$
Factors of 52: $1, 2, 4, 13, 26, 52$

Answer: $\boxed{1, 2}$

d) 9, 27 and 81

Factors of 9: $1, 3, 9$
Factors of 27: $1, 3, 9, 27$
Factors of 81: $1, 3, 9, 27, 81$

Answer: $\boxed{1, 3, 9}$