Practice MCQ Questions and Answer on Decimal Fraction

1.

$$\text{Math input error}$$   is simplified to :

• (A) 1
• (B) 0.1
• (C) 0.01
• (D) 10

Show Answer

 Given expression : = $$\frac{441 × 16}{21 × 16 × 21}$$ = $$\frac{{7056}}{{7056}}$$ = 1

2.

$$\begin{array}{rl}& \text{The}\text{value}\text{of}\\ & \frac{0.1\times 0.1\times 0.1+0.02\times 0.02\times 0.02}{0.2\times 0.2\times 0.2+0.04\times 0.04\times 0.04}\text{is}:\end{array}$$

• (A) 0.0125
• (B) 0.125
• (C) 0.25
• (D) 0.5

Show Answer

 $$\eqalign{ & {\text{Give}}\,{\text{expression}} \cr & = \frac{{{{\left( {0.1} \right)}^3} + {{\left( {0.02} \right)}^3}}}{{{2^3}\left[ {{{\left( {0.1} \right)}^3} + {{\left( {0.02} \right)}^3}} \right]}} \cr & = \frac{1}{8} \cr & = 0.125 \cr} $$

3.

6425 ÷ 125 × 8 = ?

• (A) 41.12
• (B) 64.25
• (C) 411.2
• (D) 421.25

Show Answer

 Given expression : 51.4 × 8 = 411.2

4.

Solve this : $$\text{Math input error}$$    = ?

• (A) 0.8
• (B) 1.45
• (C) 2.40
• (D) 3.25

Show Answer

 = $$\frac{0.0203 × 2.92}{0.0073 × 14.5 × 0.7}$$ = $$\frac{203 × 292}{73 × 145 × 7}$$ = $$\frac{4}{5}$$ = 0.8

5.

Solve : $$\frac{17292}{33}$$  ÷ 8 = ?

• (A) 23.5
• (B) 53.5
• (C) 65.5
• (D) 33.5

Show Answer

 = $$\frac{17292}{33}$$ × $$\frac{1}{8}$$ = $$\frac{17292}{33 × 8}$$ = 65.5

6.

The value of (0.98) + (0.02) + 3 × 0.98 × 0.02 - 1 is :33

• (A) 0
• (B) 1
• (C) 1.09
• (D) 1.98

Show Answer

 Given expression : [(0.98)3 + (0.02)3 + 3 × 0.98 × 0.02 (0.98 + 0.02)] - 1 = (0.98 + 0.02)3 - 1 = (1)3 - 1 = 0

7.

Solve $$\sqrt{197}$$ × 6.99 + 626.96 = ?

• (A) 885
• (B) 725
• (C) 825
• (D) 650

Show Answer

 Given $$\sqrt {197} $$ × 6.99 + 626.96 ≈ $$\sqrt {196} $$ × 7 + 627 = 14 × 7 + 627 = 98 + 627 = 725

8.

The value of $$\left[35.7-\left(3+\frac{1}{3+\frac{1}{3}}\right)-\left(2+\frac{1}{2+\frac{1}{2}}\right)\right]$$       is :

• (A) 30
• (B) 34.8
• (C) 36.6
• (D) 41.4

Show Answer

 Given expression : $$\eqalign{ & = 35.7 - \left( {3 + \frac{1}{{\frac{{10}}{3}}}} \right) - \left( {2 + \frac{1}{{\frac{5}{2}}}} \right) \cr & = 35.7 - \left( {3 + \frac{3}{{10}}} \right) - \left( {2 + \frac{2}{5}} \right) \cr & = 35.7 - \frac{{33}}{{10}} - \frac{{12}}{5} \cr & = 35.7 - \left( {\frac{{33}}{{10}} + \frac{{12}}{5}} \right) \cr & = 35.7 - \frac{{57}}{{10}} \cr & = 35.7 - 5.7 \cr & = 30 \cr} $$

9.

11.71 - 0.86 + 1.78 - 9.20 = ?

• (A) 2.43
• (B) 3.13
• (C) 3.43
• (D) 4.13

Show Answer

 Given expression : = (11.71 + 1.78) - (0.86 + 9.20) = 13.49 - 10.06 = 3.43

10.

$$\left(\frac{1.49\times 14.9-0.51\times 5.1}{14.9-5.1}\right)$$     is equal to :

• (A) 0.20
• (B) 2.00
• (C) 20
• (D) 22

Show Answer

 $$\eqalign{ & \left( {\frac{{1.49 \times 1.49 \times 10 - 0.51 \times 0.51 \times 10}}{{1.49 \times 10 - 0.51 \times 10}}} \right) \cr & = \frac{{10\left[ {{{\left( {1.49} \right)}^2} - {{\left( {0.51} \right)}^2}} \right]}}{{10\left( {1.49 - 0.51} \right)}} \cr & = \left( {1.49 + 0.51} \right) \cr & = 2 \cr} $$