Decimal Numbers Quiz Set 008

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Question 1

What is ${31 × 8.8 - 27 × 3.2}/4.2$?

 A

$44{8/21}$.

 B

$44{5/21}$.

 C

$44{1/21}$.

 D

$44{11/21}$.

Soln.
Ans: a

Observe that all fractional numbers are having one digit to the right of the dot. So we can cancel all the dots and get a plain expression: ${31 × 88 - 27 × 32}/42$ which equals ${932/21}$, which is same as: $44{8/21}$


Question 2

For what value of x would this expression be a perfect square: $6.39 × 6.39 + x × 6.39 + 0.5 × 0.5$?

 A

1.

 B

10.

 C

0.1.

 D

0.01.

Soln.
Ans: a

Comparing the given expression with $a^2 + 2 × a ×b + b^2 = (a + b)^2$, we see that if a = 6.39, and b = 0.5 then by inspection, x should be equal to 2b = 2 × 0.5 = 1.


Question 3

What is x in $0.001/x = 0.1$?

 A

0.01.

 B

0.1.

 C

1.0.

 D

0.001.

Soln.
Ans: a

The expression becomes $x = {1/1000} × {10}$ = 0.01.


Question 4

If $7.06/0.9$ = 7.844444, then $0.0706/9$ = ?

 A

0.007844444.

 B

0.07844444.

 C

0.7844444.

 D

7.844444.

Soln.
Ans: a

Numerator is divided by 100, and denominator multiplied by 10, so the answer should get divided by 1000.


Question 5

What is x in ${437/0.0437} = {4.37/x}$?

 A

$4.37 × 10^{-4}$.

 B

$4.37 × 10^{-3}$.

 C

$4.37 × 10^{-2}$.

 D

$4.37 × 10^{-5}$.

Soln.
Ans: a
Transposing, x = $4.37 × {0.0437/437}$ which gives 0.000437, which, in scientific form is $4.37 × 10^{-4}$.

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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 008" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2019-08-18.

Posted by Parveen(Hoven),
Aptitude Trainer


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