Decimal Numbers Quiz Set 015

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Question 1

What is $9.326 + 0.7 + 0.03$?

 A

10.056.

 B

11.056.

 C

12.056.

 D

9.056.

Soln.
Ans: a

By simple addition we get $9.326 + 0.7 + 0.03 = 10.056$.


Question 2

What is $4.823 + 0.7 + 0.05$?

 A

5.573.

 B

6.573.

 C

7.573.

 D

4.573.

Soln.
Ans: a

By simple addition we get $4.823 + 0.7 + 0.05 = 5.573$.


Question 3

Which is the smallest?

 A

$0.001^3$.

 B

$1/0.001$.

 C

$0.001$.

 D

$0.001^2$.

Soln.
Ans: a

We know that if a number is less than 1, then it becomes smaller and smaller as it is raised to higher and higher positive powers. Now, $1/0.001$ is same as $0.001^{-1}$. The three powers of 0.001 given to us are -1, 1, 2 and 3. Out of these 3 is the most positive, so, $0.001^3$ is the smallest.


Question 4

What is ${(-82) × 7.2 - 32 × (-3.4)}/2.5$?

 A

$-192{16/25}$.

 B

$-192{12/25}$.

 C

$+192{16/25}$.

 D

$+192{12/25}$.

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: ${(-82) × 72 - 32 × (-34)}/25$. We can now simpilfy the minus signs to get ${(32 × 34) - (82 × 72)}/25$ which equals ${-4816/25}$, which is same as: $-192{16/25}$


Question 5

What is ${0.60 × 0.60 × 0.60 + 0.04 × 0.04 × 0.04}/{4.20 × 4.20 × 4.20 + 0.28 × 0.28 × 0.28}$?

 A

$1/7^3$.

 B

$1/7^2$.

 C

$1/7^4$.

 D

$1/7$.

Soln.
Ans: a

By inspection, the given ratio is same as ${0.60 × 0.60 × 0.60 + 0.04 × 0.04 × 0.04}/{7^3 × ({0.60 × 0.60 × 0.60 + 0.04 × 0.04 × 0.04})}$ which is $1/7^3$.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 015" 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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