Aptitude - Decimals & Fractions Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to Decimals and Fractions. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - The fraction 36(42/1000) in the decimal form is

A - 36.42

B - 36.042

C - 364.2

D - 36.0042

Answer : B

Explanation

36(42/1000)  = 36 + 0.042 
= 36.042

Q 2 - (0.1x0.2x0.3x0.4)/4!=?

A - 10-2

B - 10-3

C - 10-4

D - 10-5

Answer : C

Explanation

 (0.1x0.2x0.3x0.4)/4!=(1x2x3x4x10(-4))/(4*3*2*1)=10(-4)

Q 3 - √(0.169/0.064)=?

A - 13/8

B - 19/8

C - 13/5

D - 1

Answer : A

Explanation

√(0.169/0.064)=√((169/1000)/(64/1000))=√(169/64)=13/8

Q 4 - If 1/6th part of a number is 150 more than 1/9th part of that number, then the number is?

A - 2100

B - 2400

C - 2500

D - 2700

Answer : D

Explanation

 Let the number be X.
 Thus 1/6X- 1/9X=150
 =>(3X-2X)/18=150
 =>X=2700

Q 5 - 3 x 0.3 x 0.03 x 0.003 x 30 = ?

A - 0.0000243

B - 0.000243

C - 0.00243

D - 0.0243

Answer : C

Explanation

  
 Number of decimal places in the product = 1 + 2 + 3 = 6.  
 3 x 3 x 3 x 3 = 2430 
 ∴ 3 x 0.3 x 0.03 x 0.003 x 30 = .00243 

Q 6 - 80.28 x 40.08 = ?

A - 80.36

B - 40.36

C - 2

D - 1

Answer : C

Explanation

 Given expression is (23)0.28 x (22)0.08 
 = 2(3 x 0.28) x 2(2 x 0.08) 
 = 2(0.84 + 0.16) 
 = 21 
 = 2 

Q 7 - (6.5 x 4.7 + 6.5 x 5.3) / (1.3 x 7.9 - 1.3 x 6.9) = ?

A - 3.9

B - 39

C - 34.45

D - 50

Answer : D

Explanation

 
 (6.5 x 4.7 + 6.5 x 5.3) / (1.3 x 7.9 - 1.3 x 6.9) = {6.5 x (4.7 + 5.3)} / {1.3 x (7.9 - 1.3)} = (6.5 x 10) / (1.3 x 1) = 50.  

Q 8 - (0.25 x 0.25 - 0.24 x 0.24) / 0.49 = ?

A - 0.0006

B - 0.49

C - 0.01

D - 0.1

Answer : C

Explanation

 
 As a2 - b2 = (a+b)(a-b)  
 ∴ (0.25 x 0.25 - 0.24 x 0.24) / 0.49 = (0.25 + 0.24)(0.25 - 0.24) / 0.49 
 = (0.49 x 0.01) / 0.49 = 0.01

Q 9 - 25.7322 - 15.7322 = ?

A - 4.1464

B - 41.464

C - 414.64

D - 4146.4

Answer : C

Explanation

 
 25.7322  - 15.7322 = (25.732 + 15.732)(25.732 - 15.732) = 41.464 x 10 = 414.64 

Q 10 - How many pieces of 12.6 cm can be cut from a log of 857 cm?

A - 58

B - 62

C - 64

D - 68

Answer : D

Explanation

 
 number of pieces = 857/12.6 = 8570/126 = 68

aptitude_decimals.htm
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