Decimal Numbers Quiz Set 006

Question 1

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\$.

Question 2

What is \$0.59646/0.006\$?

A

99.41.

B

994.1.

C

9.941.

D

0.9941.

Soln.
Ans: a

The given expression can be written as \${59646/6} × {1000/100000}\$ which is same as \${59646/6} × {1/100}\$, which is same as \$9941 × {1/100}\$, which is same as 99.41

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

If \$7.06/0.9\$ = 7.844444, then \$0.0706/9\$ = ?

A

0.007844444.

B

0.07844444.

C

0.7844444.

D

7.844444.

Soln.
Ans: a

Numerator is divided by 100, and denominator multiplied by 10, so the answer should get divided by 1000.

Question 5

What is \$0.013896/0.02\$?

A

0.6948.

B

6.948.

C

0.06948.

D

0.006948.

Soln.
Ans: a

The given expression can be written as \${13896/2} × {100/1000000}\$ which is same as \${13896/2} × {1/10000}\$, which is same as \$6948 × {1/10000}\$, which is same as 0.6948