Decimal Numbers Quiz Set 020

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Question 1

247887 is same as?

 A

$2.47887 × 10^{5}$.

 B

$2.47887 × 10^{4}$.

 C

$2.47887 × 10^{3}$.

 D

$2.47887 × 10^{2}$.

Soln.
Ans: a

Question 2

What is x in $0.008/x = 10$?

 A

0.0008.

 B

0.008..

 C

0.08..

 D

0.00008..

Soln.
Ans: a

The expression becomes $x = {8/1000} × {1/10}$ = 0.0008.


Question 3

What is $9.102 - (-0.5) + 0.04 - (-0.02)$?

 A

9.662.

 B

8.662.

 C

7.662.

 D

5.662.

Soln.
Ans: a

The given expression is same as $9.102 + 0.5 + 0.04 + 0.02$, then by simple addition we get $9.102 + 0.5 + 0.04 + 0.02 = 9.662$.


Question 4

What is ${(-32) × 2.9 - 47 × (-3.8)}/6.9$?

 A

$12{10/23}$.

 B

$12{9/23}$.

 C

$12{7/23}$.

 D

$12{11/23}$.

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: ${(-32) × 29 - 47 × (-38)}/69$. We can now simpilfy the minus signs to get ${(47 × 38) - (32 × 29)}/69$ which equals ${286/23}$, which is same as: $12{10/23}$


Question 5

What is x in $0.006/x = 0.1$?

 A

0.06.

 B

0.6.

 C

6.0.

 D

0.006.

Soln.
Ans: a

The expression becomes $x = {6/1000} × {10}$ = 0.06.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 020" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-05-17.

Posted by Parveen(Hoven),
Aptitude Trainer


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