Aptitude - Decimal Fraction

Why Aptitude Decimal Fraction?

In this section you can learn and practice Aptitude Questions based on "Decimal Fraction" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.

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How to solve Aptitude Decimal Fraction problems?

You can easily solve all kind of Aptitude questions based on Decimal Fraction by practicing the objective type exercises given below, also get shortcut methods to solve Aptitude Decimal Fraction problems.

Exercise :: Decimal Fraction - General Questions

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

Answer: Option A

Explanation:

Given expression
= (0.96)3 - (0.1)3
(0.96)2 + (0.96 x 0.1) + (0.1)2
= a3 - b3
a2 + ab + b2
= (a - b)
= (0.96 - 0.1)
= 0.86

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