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# Mathematical Opeartions Questions For RRB NTPC PDF

Download RRB NTPC Mathematical Operations  Questions and Answers PDF. Top 25 RRB NTPC  Maths  questions based on asked questions in previous exam papers very important for the Railway NTPC exam.

Question 1: If ‘+’ means ‘-’, ‘-’ means ‘*’, ‘*’ means ‘/’ and ‘/’ means ‘+’, then what is the value of the following expression?
13 – 13 / 3 – 63 * 9 + 2 -5

a) 170

b) 180

c) 190

d) 200

Question 2: If ‘+’ means ‘*’, ‘-’ means ‘+’, ‘*’ means ‘/’ and ‘/’ means ‘-’, then what is the value of the following expression?
119*17 + 6 / 16 * 2 + 5

a) 1

b) 3

c) 2

d) 4

Question 3: $\sqrt{0.07+\sqrt{0.0967-0.0643}}$ = ?

a) 0.8

b) 0.7

c) 0.6

d) 0.5

Question 4: Find $x^{2018}$, if $3x-4.5+2.4 = – 2.1$

a) 0

b) 1

c) $7^{2018}$

d) $0.7^{2018}$

Question 5: 2.1221-3.1331+4.1441 = ?

a) 9.3993

b) 3.1331

c) 6.2662

d) none of these

Question 6: $\frac{5}{10}\times \frac{100}{125} \times \frac{25}{x} = 1$, find $x$ ?

a) 20

b) 15

c) 5

d) 10

Question 7: $\sqrt{0.9-\sqrt{0.0234-0.0153}}$ = ?

a) 0.9

b) 0.99

c) 0.999

d) 9.0

Question 8: $\frac{3}{4}\times \frac{16}{27} \div \frac{2}{3} = ?$

a) 2/3

b) 3/2

c) 9/4

d) 4/9

Question 9: 0.1123-0.0012+1.0032 – 0.101 = ?

a) 1.0033

b) 1.1333

c) 1.0133

d) 1.1033

Question 10: Find x, if 4x-0.3+0.22 = 2 ?

a) 5.002

b) 5.200

c) 5.020

d) 0.520

Question 11: $15\div 3 + 2 \times 4 – 2 = x + 1$, find $x$ ?

a) 9

b) 10

c) 11

d) 12

Question 12: $\frac{6}{8}\times \frac{16}{18} \times \frac{3}{4} \times X = \frac{4}{7}$, find $1/X$ ?

a) 4/7

b) 8/7

c) 7/8

d) 7/4

Question 13: 576.78+456.87-x = 658.65, Find x ?

a) 375

b) 376

c) 373

d) 374

Question 14: Find $((4096)^{1/3})^{1/2}=?$

a) 2

b) 3

c) 4

d) 5

Question 15: 3234 + 5678 – 11223 + 4456 = ?

a) 4585

b) 3545

c) 5645

d) 2145

Question 16: Find $[((16)^{\frac{1}{4}})^{\frac{2}{3}}]^{\frac{6}{2}}$ = ?

a) 256

b) 64

c) 16

d) 4

Question 17: 123.45+45.678-3.1345+13.234 = ?

a) 146.3455

b) 169.2275

c) 156.3455

d) 179.2275

Question 18: 45.23+23.17-12.46+34.67 = ?

a) 47.86

b) 56.64

c) 67.57

d) 90.61

Question 19: $95^2-5^2=?$

a) 8100

b) 9000

c) 9025

d) 9205

Question 20: Which of the following is divisible by 3, 7, 9 and 11 ?

a) 2645

b) 4158

c) 3791

d) 1188

Question 21: 3245 – 123 – 456 – 347 + x = 3650 ?

a) 2134

b) 1331

c) 1567

d) 1467

Question 22: $600\div 12 \times \frac{1}{2} \div 5 = ?$

a) 4

b) 5

c) 6

d) 8

Question 23: 123.45 + 6789.01 – 2345.67 = ?

a) 4565.79

b) 4655.79

c) 4566.79

d) 4665.79

Question 24: 4591.15 – 528.116 = x + 456.123. Find x ?

a) 3660.911

b) 3666.911

c) 3006.911

d) 3606.911

Question 25: 987.65-456.78-43.321 = ?

a) 478.549

b) 487.549

c) 487.459

d) 478.459

Let us replace the symbols with the actual operators.

13 – 13 / 3 – 63 * 9 + 2 -5 = 13 * 13 + 3*63/9 – 2*5

Applying BODMAS rule, we get, 169 + 3*7 – 10 = 180
Therefore, option B is the right answer.

Let us replace the symbols with the actual operators.

119*17 + 6 / 16 * 2 + 5 = 119/17 * 6 – 16/2 *5

Applying BODMAS rule, we get,

119/17 * 6 – 16/2 *5 = 7*6 – 8*5
= 42 – 40
= 2

Therefore, option C is the right answer.

$\sqrt{0.07+\sqrt{0.0967-0.0643}}$ = $\sqrt{0.07+\sqrt{0.0324}}$ = $\sqrt{0.07+0.18}$ = $\sqrt{0.25}$ = $0.5$

So the answer is option D.

$3x-4.5+2.4 = – 2.1$

$3x-2.1 = – 2.1$

$3x = 0$

$x = 0$

$x^{2018} = 0$

So the answer is option A.

2.1221-3.1331+4.1441 = -1.0110+4.1441 = 3.1331

So the answer is option B.

$\frac{5}{10}\times \frac{100}{125} \times \frac{25}{x} = 1$

$\frac{10}{25} \times \frac{25}{x} = 1$

$\frac{10}{x} = 1$

$x = 10$

So the answer is option D.

$\sqrt{0.9-\sqrt{0.0234-0.0153}}$ = $\sqrt{0.9-\sqrt{0.0081}}$ = $\sqrt{0.9-0.09}$ = $\sqrt{0.81}$ = $0.9$

So the answer is option A.

$\frac{3}{4}\times \frac{16}{27} \div \frac{2}{3}$ = $\frac{3}{4}\times \frac{16}{27} \times \frac{3}{2}$ = $\frac{4}{9} \times \frac{3}{2} = \frac{2}{3}$

So the answer is option A.

0.1123-0.0012+1.0032 – 0.101 =  0.1111 + 0.9022 = 1.0133

So the answer is option C.

4x-0.3+0.22 = 2

4x-0.08 = 2

4x = 2.08

x = 0.52

So the answer is option D.

$15\div 3 + 2 \times 4 – 2 = x + 1$

$5 +8 – 2 = x + 1$

$11 = x + 1$

$x = 10$

So the answer is option B.

$\frac{6}{8}\times \frac{16}{18} \times \frac{3}{4} \times X = \frac{4}{7}$

$\frac{3}{4}\times \frac{8}{9} \times \frac{3}{4} \times X = \frac{4}{7}$

$\frac{1}{2} \times X = \frac{4}{7}$

$X = 8/7$

$1/X = 7/8$

So the answer is option B.

576.78+456.87-x = 658.65

1033.65 – x = 658.65

x = 1033.65 – 658.65

x = 375

So the answer is option A.

$((4096)^{1/3})^{1/2} = 16^{1/2} = 4$

So the answer is option C.

3234 + 5678 – 11223 + 4456 = 2145.

So the answer is option D.

$[((16)^{\frac{1}{4}})^{\frac{2}{3}}]^{\frac{6}{2}}$ = $[16]^{\frac{1}{4}\times\frac{2}{3}\times\frac{6}{2}}$ = $[16]^{\frac{1}{2}}$ = $4$

So the answer is option D.

123.45+45.678-3.1345+13.234 = 179.2275

So the answer is option D.

45.23+23.17-12.46+34.67 = 90.61

So the answer is option D.

$95^2-5^2=(95+5)(95-5) = 100*90 = 9000$

So the answer is option B.

3*7*9*11 = 2079

2079*2 = 4158 is divisible by 3, 7, 9, 11

So the answer is option B.

3245 – 123 – 456 – 347 + x = 3650

2319 + x = 3650

x = 1331

So the answer is option B.

$600\div 12 \times \frac{1}{2} \div 5 = 50 \times 1/10 = 5$

So the answer is option B.

123.45 + 6789.01 – 2345.67 = 6912.46 – 2345.67 = 4566.79

So the answer is option C.

4591.15 – 528.116 = x + 456.123

4063.034 = x + 456.123

4063.034 – 456.123 = x

3606.911 = x

So the answer is option D.