Decimal Numbers Quiz Set 012

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Question 1

What is y in $9.69 + 0.1 + y = 0.09$?

 A

-9.7.

 B

+9.7.

 C

-7.9.

 D

+7.9.

Soln.
Ans: a

y = 0.09 - (0.1 + 9.69) = -9.7.


Question 2

For what value of x would this expression be a perfect square: $9.14 × 9.14 + x × 9.14 + 0.1 × 0.1$?

 A

0.2.

 B

2.0.

 C

0.002.

 D

0.02.

Soln.
Ans: a

Comparing the given expression with $a^2 + 2 × a ×b + b^2 = (a + b)^2$, we see that if a = 9.14, and b = 0.1 then by inspection, x should be equal to 2b = 2 × 0.1 = 0.2.


Question 3

What is $5.463 + 0.9 + 0.09$?

 A

6.453.

 B

6.345.

 C

6.545.

 D

6.553.

Soln.
Ans: a

By simple addition we get $5.463 + 0.9 + 0.09 = 6.453$.


Question 4

What is z in $2.285 + 0.4 - z = 0.02$?

 A

+2.665.

 B

-2.665.

 C

+2.556.

 D

-2.556.

Soln.
Ans: a

z = (0.4 + 2.285) - 0.02 = 2.665.


Question 5

For what value of x would this expression be a perfect square: $8.88 × 8.88 + x × 8.88 + 0.2 × 0.2$?

 A

0.4.

 B

0.8.

 C

0.2.

 D

0.1.

Soln.
Ans: a

Comparing the given expression with $a^2 + 2 × a ×b + b^2 = (a + b)^2$, we see that if a = 8.88, and b = 0.2 then by inspection, x should be equal to 2b = 2 × 0.2 = 0.4.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 012" 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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