# Decimal Numbers Quiz Set 012

### 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. 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 2020-02-07. Published on: 2016-04-21