# Exam

Exam
1.- Decide which of these sentences is true:

 a) 15 is a factor of 3 b) 3 is a factor of 15 c) 3 is a multiple of 15 d) 3 is divisible by 15

2.-  Decide which of these sentences is true:

 a) 8 is a factor of 16 b) 16 is a multiple of 8 c) 16 is divisible by 8 d) All of them

3.- 135.806 ...

 a) ...is divisible by 11 b) ...is not divisible by 11 c) ...is divisible by 5 d) None of them

4.- 4434...

 a) ...is not divisible by 6 b) ...is not divisible by 3 c) ...is divisible by 6 d) None of them

5.- 221...

 a) ...is a composite number b) ...is a coprime number c) ...is a prime number d) None of them

6.- 113...

 a) ...is a composite number b) ...is a coprime number c) ...is a prime number d) None of them

7.- The factorization of 2520 is...

 a) 22 · 33 · 5 · 7 b) 22 · 32 · 5 · 7 c) 23 · 3 · 5 · 7 d) 23 · 32 · 5 · 7

8.-  The factorization of 1350 is...

 a) 2 · 33 · 52 b) 22 · 33 · 52 c) 2 · 32 · 53 d) 2 · 32 · 52 · 7

9.- lcm(24,36,54)=

 a) 54 b) 108 c) 162 d) 216

10.- HCF(12,18,24)=

 a) 2 b) They are coprimes c) 6 d) 4