This set of Aptitude Questions and Answers (MCQs) focuses on “Decimal Numbers”.

1. What is the HCF of 0.032, 0.96 and 1.6?

a) 0.032

b) 0.0032

c) 0.016

d) 0.008

View Answer

Explanation: HCF of 32, 960 and 1600 is 32.

Hence, the HCF of 0.032, 0.96 and 1.6 is 0.032.

2. What is the LCM of 4.1, .246 and 61.5?

a) 123

b) 61.5

c) 183.9

d) 306.5

View Answer

Explanation: LCM of 4100, 246 and 61500 is 61500.

Therefore, LCM of 4.1, .246 and 61.5 is 61.5.

3. What is the GCD of 1.14, 0.38 and 0.95?

a) 0.19

b) 0.14

c) 0.095

d) 0.38

View Answer

Explanation: GCD of 114, 38 and 95 is 19.

Therefore, the GCD of 1.14, 0.38 and 0.95 is 0.19.

4. Find the LCM of 1.44, 21.6 and 0.324.

a) 21.6

b) 43.2

c) 64.8

d) 86.4

View Answer

Explanation: LCM of 1440, 21600 and 324 is 64800.

Therefore, the LCM of 1.44, 21.6 and 0.324 is 64.8.

5. The HCF and LCM of two numbers is 0.45 and 2.7, if one of the numbers is 1.35, then find the other.

a) 1.9

b) 0.9

c) 0.18

d) 0.19

View Answer

Explanation: We know that product of two numbers = HCF*LCM.

Other number = \(\frac{0.45*2.7}{1.35}\)=0.9.

6. If HCF and LCM of two numbers is 0.27 and 16.2, if one of the numbers is 0.18, then find the other number.

a) 5.4

b) 6.4

c) 12.8

d) 16.2

View Answer

Explanation: We know that product of two numbers = HCF*LCM.

Other number = \(\frac{0.27*16.2}{0.18}\)=5.4.

7. If LCM of two numbers is 2.15, then which of the following could not be its HCF?

a) 0.05

b) 0.01

c) 1

d) 0.015

View Answer

Explanation: We know that LCM is a multiple of HCF.

2.15 is a multiple of 0.05 and 0.01. 1 can be HCF of two numbers, if they don’t have any factors in common.

Therefore, 0.015 cannot be its HCF.

8. The product of two numbers is 0.891 and its HCF is 0.9. Find the largest number.

a) 0.91

b) 0.99

c) 0.9

d) 0.81

View Answer

Explanation: The numbers be 0.9a and 0.9b.

We know that product of two numbers = HCF*LCM = 0.891.

0.9a * 0.9b = 0.891.

ab = 1.1, so that a=1 and b=1.1.

Therefore, the largest number is 1.1*0.9=0.99.

9. The HCF of two number is 0.2 and their difference is 1. Find the numbers.

a) 0.2 and 1.0

b) 0.4 and 1.6

c) 0.4 and 1.4

d) 0.7 and 1.4

View Answer

Explanation: From the options, only 0.4 and 1.4 pair satisfy both the conditions i.e., HCF of two number is 0.2 and their difference is 1.

Hence, the numbers are 0.4 and 1.4.

10. If HCF of two numbers is 0.51, then which of the following could possibly be its LCM?

a) 27.03

b) 15.08

c) 12.09

d) 9.01

View Answer

Explanation: We know that HCF is a factor of LCM.

27.03 is a factor of 0.51.

Hence, 0.51 could possibly be its LCM.

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