HCF and LCM Worksheet-10

HCF and LCM Worksheet-10

1. The Lowest Common Multiple of two numbers is 3,718. Which of the following cannot be the Greatest Common Factor of these numbers?

(a) 13                  (b) 104               (c) 143                (d) 26

2. GCF of two numbers 'a' and 'b' is 1. What is the LCM of those two numbers?

(a) a – b             (b) b – a             (c) ab                  (d) a + b

3. The product of two numbers is 6,400. The largest number that can divide these two numbers without remainder is 16. The LCM of these two numbers is _____.

(a) 150                (b) 100               (c) 400               (d) 200

4. The LCM of two numbers is 192 and their GCF is 16. Find the other number if one of the numbers is 32.

(a) 96                  (b) 48                 (c) 18                  (d) 36

5. What are the LCM and GCF of two numbers 18 and 27?

(a) LCM = 86, HCF = 16            (b) LCM = 94, HCF = 16

(c) LCM = 64, HCF = 12            (d) LCM = 54, HCF = 9

6. The LCM of two numbers 'x' and 'y' is 100. Their HCF is _____.

(a)               (b) xy × 100      (c) xy + 100       (d) x + y

7. The LCM of two numbers is 336 and their GCF is 28. If one of the numbers is 84 then find the other number.

(a) 128                (b) 112                (c) 96                  (d) 124

8. GCF of two numbers is 1 and their LCM is 17. What is the product of these two numbers?

(a) 17                  (b) 16                  (c) 171                 (d) None

9. The LCM of 5 and 20 is 20. What is their GCF?

(a) 40                 (b) 100               (c) 5                    (d) 20

10. The LCM and GCF of 'a' and 'b' is 96 and 4 respectively. If a = 32 then find the value of 'b'?

(a) 16                  (b) 12                  (c) 18                  (d) 14

Answer Key:

1. (b)
2. (c)
3. (c)
4. (a)
5. (d)
6. (a)
7. (b)
8. (a)
9. (c)
10. (b)