Factors,Prime Numbers and Number Bases

The only prime number which is an even number is (a)  

A number that is the same when written either from the front or the back is called a ____

• arabic number

• binary number

• palindrome

• vigesimal

Which of the options is not a factor of 15 ?

• 1

• 3

• 7

• 15

The prime factors of 15 is ______

• 3

• 5

• 3 and 5

• 1 and 3

Express 72 as product of prime factors

• None of the options

Which of the numbers 1,7,9,10 are prime numbers?

(a)  

Which of the numbers 13,17,19,21 are composite numbers ?

(a)  

The HCF of 48 and 80 is ____

• 20

• 8

• 16

• 2

The LCM of 6,8 and 12 is ____

• 12

• 2

• 24

• 48

A number that has more than two factors is called a (a)   number.