Maths: Decimal Fraction Questions for SBI, IBPS, SSC

Decimal Fraction Questions: A lot of questions are asked on Decimal Fraction in various competitive exams such as SBI, IBPS PO and Clerk, SSC CGL, CHSL, Railways, other exams. If you prepare this topic thoroughly, you can score good marks in maths section. Candidates can attempt questions given below and ask doubts in comment section. Click here to join whatsapp/telegram study group

Decimal Fraction Questions

Q) Evaluate : [{(2.39)2 – (1.61)2} / (2.39 – 1.61)]
A. 2
B. 4
C. 6
D. 8

Answer & Explanation
Answer: Option B
Explanation:
Given Expression = [(a2 – b2) / (a – b)] = [{(a + b)(a – b)} / (a – b)] = (a + b) = (2.39 + 1.61) = 4.

Q) What decimal of an hour is a second?
A. .0025
B. .0256
C. .00027
D. .000126

Answer & Explanation
Answer: Option C
Explanation:
Required decimal = [1 / (60 * 60)] = (1/3600) = .00027

Q) If 2994 ÷ 14.5 = 172, then 29.94 ÷ 1.45 = ?
A. 0.172
B. 1.72
C. 17.2
D. 172

Answer & Explanation
Answer: Option C
Explanation:
(29.94/1.45) = (299.4/14.5)
= [(2994/14.5) * (1/10)] [Here, Substitute 172 in the place of (2994/14.5)]
= (172/10) = 17.2

Q) (.009/?) = .01
A. .0009
B. .09
C. .9
D. 9

Answer & Explanation
Answer: Option C
Explanation:
Let (.009/x) = .01;
Then, x = (.009/.01) = (.9/1) = .9

Q) The expression (11.98 * 11.98 + 11.98 * x + 0.02 * 0.02) will be a perfect square for x equal to:
A. 0.02
B. 0.2
C. 0.04
D. 0.4

Answer & Explanation
Answer: Option C
Explanation:
Given expression = (11.98)2 + (0.02)2 + 11.98 * x.
For the given expression to be a perfect square, we must have
6.98 * x = 2 * 11.98 * 0.02
⇒ x = 0.04

Q) 3889 + 12.952 – ? = 3854.002
A. 47.095
B. 47.752
C. 47.932
D. 47.95

Answer & Explanation
Answer: Option D
Explanation:
Let 3889 + 12.952 – x = 3854.002.
Then x = (3889 + 12.952) – 3854.002
= 3901.952 – 3854.002
= 47.95.

Q) 0.04 * 0.0162 is equal to:
A. 6.48 * 10-3
B. 6.48 * 10-4
C. 6.48 * 10-5
D. 6.48 * 10-6

Answer & Explanation
Answer: Option B
Explanation:
4 * 162 = 648.
Sum of decimal places = 6.
So, 0.04 * 0.0162 = 0.000648 = 6.48 * 10-4

Q) [(4.2 * 4.2 – 1.9 * 1.9) / (2.3 * 6.1)] is equal to:
A. 0.5
B. 1.0
C. 20
D. 22

Answer & Explanation
Answer: Option B
Explanation:
Given Expression = [(a2 – b2) / {(a + b)(a – b)}] = [(a2 – b2) / (a2 – b2)] = 1.

Q) If (144/0.144) = (14.4/x), then the value of x is:
A. 0.0144
B. 1.44
C. 14.4
D. 144

Answer & Explanation
Answer: Option A
Explanation:
(144/0.144) = (14.4/x)
⇒ [(144 * 1000) / 144] = (14.4/x)
⇒ x = (14.4/1000) = 0.0144

Q) The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 15 paise every year. If in 2001, the price of commodity X was Rs. 4.20 and that of Y was Rs. 6.30, in which year commodity X will cost 40 paise more than the commodity Y?
A. 2010
B. 2011
C. 2012
D. 2013

Answer & Explanation
Answer: Option B
Explanation:
Suppose commodity X will cost 40 paise more than Y after z years.
Then, (4.20 + 0.40z) – (6.30 + 0.15z) = 0.40
⇒ 0.25z = 0.40 + 2.10
⇒ z = (2.50/0.25) = (250/25) = 10.
.’. X will cost 40 paise more than Y 10 years after 2001 i.e., 2011.

Q) Which of the following fractions is greater than (3/4) and less than (5/6)?
A. ½
B. 2/3
C. 4/5
D. 9/10

Answer & Explanation
Answer: Option C
Explanation:
(3/4) = 0.75, (5/6) = 0.833, (1/2) = 0.5, (2/3) = 0.66, (4/5) = 0.8, (9/10) = 0.9.
Clearly, 0.8 lies between 0.75 and 0.833.
.’. (4/5) lies between (3/4) and (5/6).

Q) The value of [(489.1375 * 0.0483 * 1.956) / (0.0873 * 92.581 * 99.749)] is closest to:
A. 0.006
B. 0.06
C. 0.6
D. 6

Answer & Explanation
Answer: Option B
Explanation:
[(489.1375 * 0.0483 * 1.956) / (0.0873 * 92.581 * 99.749)] ≈ [(489 * 0.05 * 2) / (0.09 * 93 * 100)]
= [489 / (9 * 93 * 10)] = (163/279) * (1/10) = (0.58/10) = 0.058 ≈ 0.06.

Q) 0.002 * 0.5 = ?
A. 0.0001
B. 0.001
C. 0.01
D. 0.1

Answer & Explanation
Answer: Option B
Explanation:
2 * 5 = 10.
Sum of decimal places = 4
.’. 0.002 * 0.5 = 0.001

Q) Which of the following is equal to 3.14 x 106?
A. 314
B. 3140
C. 3140000
D. None of these

Answer & Explanation
Answer: Option C
Explanation:
3.14 * 106 = 3.14 * 1000000 = 3140000.

Q) [{(5 * 1.6) – (2 * 1.4)} / 1.3] = ?
A. 0.4
B. 1.2
C. 1.4
D. 4

Answer & Explanation
Answer: Option D
Explanation:
Given Expression = [(8 – 2.8) / 1.3] = (5.2/1.3) = (52/13) = 4.

Q) How many digits will be there to the right of the decimal point in the product of 95.75 and .02554?
A. 5
B. 6
C. 7
D. None of these

Answer & Explanation
Answer: Option B
Explanation:
Sum of decimal places = 7.
Since the last digit to the extreme right will be zero (since 5 * 4 = 20), so there will be 6 significant digits to the right of the decimal point.

Q) The fraction 101(27/100000) in decimal for is:
A. .01027
B. .10127
C. 101.00027
D. 101.000027

Answer & Explanation
Answer: Option C
Explanation:
101(27/100000) = [101 + (27/100000)] = 101 + .00027 = 101.00027

Q) [(0.0203 * 2.92) / (0.0073 * 14.5 * 0.7)] = ?
A. 0.8
B. 1.45
C. 2.40
D. 3.25

Answer & Explanation
Answer: Option A
Explanation:
[(0.0203 * 2.92) / (0.0073 * 14.5 * 0.7)] = [(203 * 292) / (73 * 145 * 7)] = (4/5) = 0.8

Q) 4.036 divided by 0.04 gives:
A. 1.009
B. 10.09
C. 100.9
D. None of these

Answer & Explanation
Answer: Option C
Explanation:
(4.036 / 0.04) = (403.6 / 4) = 100.9

LEAVE A REPLY

Please enter your comment!
Please enter your name here

spot_img

Related