Numbers Worksheet-4

Numbers Worksheet-4

The two consecutive prime numbers with difference 2 are called

(a) co-primes (b) twin primes

The two numbers which have only 1 as their common factor are called

(a) co-primes (b) twin primes

The numbers which are not multiples of 2 are called

(a) even (b) odd (c) prime (d) composite

The numbers which have more than two factors are called

(a) even (b) prime (c) composite (d) none

The numbers which have only two factors (1 and the number itself) are called as

(a) composite (b) even (c) prime (d) none

The number which is neither prime nor composite is

(a) 0 (b) 1 (c) 2 (d) 5

LCM of two co-prime numbers is their

(a) sum (b) difference (c) product (d) quotient

LCM of 36 and 72 is

(a) 36 (b) 72 (c) 108 (d) 2

LCM 12, 24 and 36 is

(a) 36 (b) 24 (c) 72 (d) 108

LCM of 17 and 5 is

(a) 105 (b) 95 (c) 85 (d) 5

LCM of 36 and 72 is

(a) 36 (b) 72 (c) 144 (d) 54

An example for twin primes is

(a) 5, 11 (b) 3, 5 (c) 11,17 (d) 3,7

HCF of 36 and 144 is

(a) 36 (b) 144 (c) 4 (d) 2

LCM of 4 and 9 is

(a) 32 (b) 40 (c) 45 (d) 36

HCF of two co-prime numbers is

(a) 1 (b) 0 (c) 2 (d) none

HCF of the two numbers =

(a) Product of numbers ÷ their LCM

(b) Product of numbers × their LCM

(d) none

LCM of the two numbers =

(a) Product of numbers ÷ their HCF

(b) Product of numbers × their HCF

(d) none

HCF of 120, 144 and 216 is

(a) 38 (b) 24 (c) 120 (d) 144

Common factors of 9 and 36 are

(a) 1, 3, 9 (b) 1, 4, 3, 5, 9

Three common multiples of 18 and 6

(a) 18, 6, 9 (b) 18, 36, 6 (c) 36, 54, 72 (d) none

Answer Key:

(1)-(b); (2)-(a); (3)-(b); (4)-(c); (5)-(c); (6)-(b); (7)-(c); (8)-(b); (9)-(c); (10)-(c); (11)-(b); (12)-(b); (13)-(a); (14)-(d); (15)-(a); (16)-(a); (17)-(a); (18)-(b); (19)-(a); (20)-(c)