Decimal Numbers Quiz Set 001

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Question 1

What is ${0.40 × 0.40 × 0.40 + 0.05 × 0.05 × 0.05}/{2.00 × 2.00 × 2.00 + 0.25 × 0.25 × 0.25}$?

 A

$1/5^3$.

 B

$1/5^2$.

 C

$1/5$.

 D

$1/5^4$.

Soln.
Ans: a

By inspection, the given ratio is same as ${0.40 × 0.40 × 0.40 + 0.05 × 0.05 × 0.05}/{5^3 × ({0.40 × 0.40 × 0.40 + 0.05 × 0.05 × 0.05})}$ which is $1/5^3$.


Question 2

What is $18{54/10000}$?

 A

18.0054.

 B

18.054.

 C

18.00054.

 D

18.54.

Soln.
Ans: a

The given expression can be written as ${18 × 10000 + 54}/10000$ which is same as $180054/10000$ which gives 18.0054


Question 3

For what value of x would this expression be a perfect square: $6.16 × 6.16 - x × 6.16 + 0.3 × 0.3$?

 A

0.6.

 B

0.06.

 C

0.0006.

 D

6.0.

Soln.
Ans: a

Comparing the given expression with $a^2 - 2 × a ×b + b^2 = (a - b)^2$, we see that if a = 6.16, and b = 0.3 then by inspection, x should be equal to 2b = 2 × 0.3 = 0.6.


Question 4

What is ${(-63) × 2.5 - 95 × (-6.3)}/6.4$?

 A

$68{29/32}$.

 B

$68{27/32}$.

 C

$68{31/32}$.

 D

$68{28/32}$.

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: ${(-63) × 25 - 95 × (-63)}/64$. We can now simpilfy the minus signs to get ${(95 × 63) - (63 × 25)}/64$ which equals ${2205/32}$, which is same as: $68{29/32}$


Question 5

What is $6.845 - (-0.1) + 0.04 - (-0.08)$?

 A

7.065.

 B

8.065.

 C

6.065.

 D

9.065.

Soln.
Ans: a

The given expression is same as $6.845 + 0.1 + 0.04 + 0.08$, then by simple addition we get $6.845 + 0.1 + 0.04 + 0.08 = 7.065$.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 001" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-08-12.

Posted by Parveen(Hoven),
Aptitude Trainer


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