Factors and Multiples

Which of the following is not a prime number ?

(i) 103

(ii) 137

(iii) 161

(iv) 179

• 103

• 137

• 161

• 179

A number is divisible by 18 if it is divisible by both 3 and 6.

• TRUE

• FALSE

The prime factorization of each of the following numbers:

90

• 2 X 3 X 3 X 5

• 2 X 3 X 5 X 5

• 2 X 2 X 3 X 5

• 2 X 2 X 2 X 5

HCF of 58, 70 is _____

• 14

• 2

• 29

• 14

The HCF of two co-prime numbers is ____

• 0

• 1

• 2

• 3

Check whether that the following pairs are co-primes:

161, 192

• YES

• NO

The HCF of two numbers is 145 and their LCM is 2175. If one of the numbers is 725, find the other.

• 435

• 450

• 215

• 690

Find the LCM of

145, 232

• 4802

• 1250

• 1160

• 9624

Test the divisibility of:

1568479 by 11

• YES

• NO

The prime factorization of 396 is ______

• 2 x 3 x 5 x 5

• 2 x 2 x 2 x 3 x 3 x 3 x 11

• 2 x 2 x 3 x 3 x 17

• 2 x 2 x 3 x 3 x 11