HCF and LCM

What are two numbers called having only 1 as a common factor.

• co-prime numbers

• twin prime numbers

• composite numbers

• prime numbers

The HCF of two co-prime numbers is

• 0

• 3

• 2

• 1

The HCF of 12 and 16 is _______.

• 2

• 4

• 6

• 1

The LCM of 12 and 16 is ________.

• 24

• 48

• 96

• 32

Which of them is a composite number?

• 45

• 11

• 31

• 13

The number of multiples of a number 5 is ______

• 10

• 100

• 1000

• infinite

The smallest composite number is ______

• 4

• 1

• 9

• 6

Which of these is the factor of 50 ?

• 10

• 3

• 7

• 6

What is the sixth multiple of 13 ?

• 78

• 65

• 52

• 91

Which of them is a prime number ?

• 13

• 14

• 28

• 25