QUESTIONS ON LCM AND HCF

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QUESTIONS ON LCM AND HCF

1.       The GCM of 108, 144, 180 is

a.       32

b.      38

c.       36

d.      42

e.      none of these

2.       The GCM of 8/25 and 12/35 is

a.       4/5

b.      24/175

c.       24/5

d.      5/24

e.      4/175

3.       The LCM of 852 and 1491 is

a.       6954

b.      5496

c.       5694

d.      5964

e.      None of these

4.       LCM of 2/3 and 4/9 is

a.       2/9

b.      2/3

c.       4/9

d.      4/3

e.      none of these

5.       The product of two numbers is 6760 and their GCM is 13. The numbers are

a.       15,520; 55,104

b.      13,520; 65,104

c.       13,104; 65,520

d.      15,104; 55,620

e.      none of these

6.       The smallest number which when divided by 15,18 and 20 leaves in each case 2 as remainder is

a.       92

b.      102

c.       122

d.      182

e.      none of these

7.       The GCM of two numbers is 12 and their LCM is 144. If one of the numbers is 36, the other is

a.       48

b.      58

c.       50

d.      4

e.      none of these

8.       The GCM of 2.5, 0.5 and .175 is

a.       1.75

b.      0.05

c.       0.025

d.      17.005

e.      none of these

9.       The LCM of 3.6, .9, .045 is

a.       .9

b.      3.6

c.       .045

d.      36

e.      none of these

10.   The LCM of two numbers is 28 times their HCF. The sum of their LCM and HCF is 1740. If one of the numbers is 240, the other number is

a.       390

b.      410

c.       400

d.      420

e.      none of these

ANSWERS