Decimal Numbers Quiz Set 010

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Question 1

What is x in ${722/0.0722} = {7.22/x}$?

 A

$7.22 × 10^{-4}$.

 B

$7.22 × 10^{-3}$.

 C

$7.22 × 10^{-2}$.

 D

$7.22 × 10^{-5}$.

Soln.
Ans: a
Transposing, x = $7.22 × {0.0722/722}$ which gives 0.000722, which, in scientific form is $7.22 × 10^{-4}$.

Question 2

What is $3.914 - (-0.8) + 0.09 - (-0.03)$?

 A

+4.834.

 B

-4.834.

 C

+4.348.

 D

-4.348.

Soln.
Ans: a

The given expression is same as $3.914 + 0.8 + 0.09 + 0.03$, then by simple addition we get $3.914 + 0.8 + 0.09 + 0.03 = 4.834$.


Question 3

What is y in $9.073 + 0.8 + y = 0.02$?

 A

-9.853.

 B

-8.853.

 C

-7.853.

 D

-10.853.

Soln.
Ans: a

y = 0.02 - (0.8 + 9.073) = -9.853.


Question 4

What is ${(-79) × 6.5 - 54 × (-2.6)}/1.2$?

 A

$-310{11/12}$.

 B

$+310{11/12}$.

 C

$-310{7/12}$.

 D

$+310{7/12}$.

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: ${(-79) × 65 - 54 × (-26)}/12$. We can now simpilfy the minus signs to get ${(54 × 26) - (79 × 65)}/12$ which equals ${-3731/12}$, which is same as: $-310{11/12}$


Question 5

What is x in $0.083/x = 0.0083$?

 A

10.

 B

1.

 C

100.

 D

0.1.

Soln.
Ans: a

The expression becomes $x = {83/83} × {10000/1000}$ = 10.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 010" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-10-26.

Posted by Parveen(Hoven),
Aptitude Trainer


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