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.
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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
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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
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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
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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
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Answers & Solutions:
1) Answer (B)
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.
2) Answer (C)
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.
3) Answer (D)
$\sqrt{0.07+\sqrt{0.0967-0.0643}}$ = $\sqrt{0.07+\sqrt{0.0324}}$ = $\sqrt{0.07+0.18}$ = $\sqrt{0.25}$ = $0.5$
So the answer is option D.
4) Answer (A)
$3x-4.5+2.4 = – 2.1$
$3x-2.1 = – 2.1$
$3x = 0$
$x = 0$
$x^{2018} = 0$
So the answer is option A.
5) Answer (B)
2.1221-3.1331+4.1441 = -1.0110+4.1441 = 3.1331
So the answer is option B.
6) Answer (D)
$\frac{5}{10}\times \frac{100}{125} \times \frac{25}{x} = 1$
$\frac{10}{25} \times \frac{25}{x} = 1$
$\frac{10}{x} = 1$
$x = 10$
So the answer is option D.
7) Answer (A)
$\sqrt{0.9-\sqrt{0.0234-0.0153}}$ = $\sqrt{0.9-\sqrt{0.0081}}$ = $\sqrt{0.9-0.09}$ = $\sqrt{0.81}$ = $0.9$
So the answer is option A.
8) Answer (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.
9) Answer (C)
0.1123-0.0012+1.0032 – 0.101 = 0.1111 + 0.9022 = 1.0133
So the answer is option C.
10) Answer (D)
4x-0.3+0.22 = 2
4x-0.08 = 2
4x = 2.08
x = 0.52
So the answer is option D.
11) Answer (B)
$15\div 3 + 2 \times 4 – 2 = x + 1$
$5 +8 – 2 = x + 1$
$11 = x + 1$
$x = 10$
So the answer is option B.
12) Answer (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.
13) Answer (A)
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.
14) Answer (C)
$((4096)^{1/3})^{1/2} = 16^{1/2} = 4$
So the answer is option C.
15) Answer (D)
3234 + 5678 – 11223 + 4456 = 2145.
So the answer is option D.
16) Answer (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.
17) Answer (D)
123.45+45.678-3.1345+13.234 = 179.2275
So the answer is option D.
18) Answer (D)
45.23+23.17-12.46+34.67 = 90.61
So the answer is option D.
19) Answer (B)
$95^2-5^2=(95+5)(95-5) = 100*90 = 9000$
So the answer is option B.
20) Answer (B)
3*7*9*11 = 2079
2079*2 = 4158 is divisible by 3, 7, 9, 11
So the answer is option B.
21) Answer (B)
3245 – 123 – 456 – 347 + x = 3650
2319 + x = 3650
x = 1331
So the answer is option B.
22) Answer (B)
$600\div 12 \times \frac{1}{2} \div 5 = 50 \times 1/10 = 5$
So the answer is option B.
23) Answer (C)
123.45 + 6789.01 – 2345.67 = 6912.46 – 2345.67 = 4566.79
So the answer is option C.
24) Answer (D)
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.
25) Answer (B)
987.65-456.78-43.321 = 530.87 – 43.321 = 487.549
So the answer is option B.
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