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 - 0.00005755 when expressed in powers of 10 is

A - 5755x10-5

B - 57.55x10-5

C - 5.755x10-5

D - 5.755x10-9

Answer : C

Explanation

5.755x10-5

Q 2 - If √14=3.74, then √(7/2)=?

A - 1.9

B - 1.87

C - 1.84

D - 1.81

Answer : B

Explanation

 √(7/2)=√((7x2)/(2x2))=√(14/4)=3.74/2=1.87

Q 3 - (0.036-0.018)/(0.0036/36)=?

A - 2

B - 6

C - 12

D - 18

Answer : D

Explanation

(0.036-0.018)/(0.036/36)=   (36/1000-18/1000)/(36/1000) x36=((36-18)/1000)/(36/1000) x36=18/36 x36=18

Q 4 - Find the sum of the largest and the smallest fraction in 3/5, 6/5, 9/8, 7/3

A - 2.53

B - 2.63

C - 2.83

D - 2.93

Answer : D

Explanation

3/5=0.6, 6/5=1.2, 9/8=1.12 and 7/3=2.33
 => sum of largest & smallest fraction is 2.33 + 0.6=2.93

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 - 12.1 / 19.8 = ?

A - 7/9

B - 11/18

C - 13/17

D - 11/19

Answer : B

Explanation

 
 12.1/19.8 = 121/198 = 11/18. 

Q 7 - If 80.40 / 20 -(-4.2) = x. What is x?

A - 497.8

B - 5.786

C - 947

D - 8.22

Answer : D

Explanation

    
 80.40 / 20 -(-4.2) = 4.02 + 4.2 = 8.22. 

Q 8 - (0.87 x 0.87 x 0.87 + 0.13 x 0.13 x 0.13) / (0.87 x 0.87 - 0.87 x 0.13 + 0.13 x 0.13)= ?

A - 0.13

B - 0.73

C - 0.9

D - 1

Answer : D

Explanation

 
 As a3 + b3 = (a+b)(a2-ab + b2) 
 Thus (a3 + b3) / (a2-ab + b2)  = a + b  
 ∴ (0.87 x 0.87 x 0.87 + 0.13 x 0.13 x 0.13) / (0.87 x 0.87 - 0.87 x 0.13 + 0.13 x 0.13) = 0.87 + 0.13 = 1

Q 9 - 0.2222 + 0.3333 + .03232 = ?

A - 0.7777

B - 0.8282

C - 0.8686

D - 0.8787

Answer : D

Explanation

 
 0.2222 + 0.3333 + .03232 = 2/9 + 3/9 + 32/99 = 5/9 + 32/99 = (55+32)/99 = 87/99 = 0.8787 

Q 10 - What will the number if its square is equal to the difference of the squares of 75.15 and 60.12?

A - 45.09

B - 46.09

C - 47.09

D - 48.09

Answer : A

Explanation

 
 let the number be x  
 => x2 = 75.152 - 60.122 = (75.15 +60.12)(75.15-60.12) = 135.27 x 15.03 
 = 9 x 15.03 x 15.03 
 = > x = 3 x 15.03 = 45.09 

aptitude_decimals.htm
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