HCF

Question 1

Which is the largest number that divides 17, 23, 35, 59 to leave the same remainder in each case ?

• 2
• 3
• 6
• 12

Question 2

Express 252 as a product of primes.

• 2 * 2 * 3 * 3 * 7
• 3* 3 * 3 * 3 * 7
• 2 * 2 * 2* 3 * 7
• 2 * 3 * 3 * 3 * 7

Question 3

Which of the following has the most number of divisors?

• 99
• 101
• 176
• 182

Question 4

A perfect number n is a number which is equal to the sum of its divisors. Which of the following is a perfect number?

• 6
• 9
• 15
• 21

Question 5

Express 1095/1168 in its simplest form.

• 13/16
• 15/16
• 17/26
• 25/26

Question 6

Find the highest common factor of the following numbers: 4 * 27 * 3125 8 * 9 * 25 * 7 16 * 81 * 5 * 11 * 49

• 180
• 360
• 540
• 1260

Question 7

Calculate the HCF of 36 and 84.

• 4
• 6
• 12
• 18

Question 8

Calculate the HCF of 1.08, 0.36 and 0.9.

• 0.03
• 0.9
• 0.18
• 0.108

Question 9

Three numbers are in the ratio 1:2:3 and their HCF is 12. The numbers are:

• 4, 8, 12
• 5, 10, 15
• 10, 20, 30
• 12, 24, 36

Question 10

The sum if two numbers is 528 and their HCF is 33. The number of pairs of numbers satisfying the above condition is:

• 4
• 6
• 8
• 12