decimal fraction aptitude questions

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1.  

Evaluate : (2.39)2 – (1.61)2
2.39 – 1.61
A. 2 B. 4
C. 6 D. 8

Answer: Option B

Explanation:

 

Given Expression = a2 – b2 = (a + b)(a – b) = (a + b) = (2.39 + 1.61) = 4.
a – b (a – b)
2. What decimal of an hour is a second ?
A. .0025 B. .0256
C. .00027 D. .000126

Answer: Option C

Explanation:

 

Required decimal = 1 = 1 = .00027
60 x 60 3600
3.  

The value of (0.96)3 – (0.1)3 is:
(0.96)2 + 0.096 + (0.1)2
A. 0.86 B. 0.95
C. 0.97 D. 1.06
4.  

The value of 0.1 x 0.1 x 0.1 + 0.02 x 0.02 x 0.02 is:
0.2 x 0.2 x 0.2 + 0.04 x 0.04 x 0.04
A. 0.0125 B. 0.125
C. 0.25 D. 0.5

Answer: Option B

Explanation:

 

Given expression = (0.1)3 + (0.02)3 = 1 = 0.125
23 [(0.1)3 + (0.02)3] 8
5. If 2994 ÷ 14.5 = 172, then 29.94 ÷ 1.45 = ?
A. 0.172 B. 1.72
C. 17.2 D. 172

Answer: Option C

Explanation:

 

 

29.94 = 299.4
1.45 14.5

 

= 2994 x 1 [ Here, Substitute 172 in the place of 2994/14.5 ]
14.5 10

 

= 172
10

= 17.2

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