Approximation Questions PDF for IBPS Clerk, NIACL, NABARD, 2018

Directions: What value will come in place of question mark (?) in the following questions: (You are not expected to calculate the exact value)
1
(624.983  –  144.001)  × (168.945  +  899.923) = ?
» Explain it
A
Making approximation,

624.983 = 625

144.001 = 144

168.945 = 169

899.923 = 900

Now,

(625144) × (169 + 900) = ?

(25 – 12) × (13 + 30) = ?

13 × 43 = ?

? =  559 Hence, option (A) is correct.
 
2
59.02 – 345.02 ÷ 22.984 = 11 × ?
» Explain it
B
Making approximation,

59 –  345  = 11 × ?
23

59 – 15 = 11 × ?

44 = 11 × ?

? =  44 ÷ 11

? =  44
11

? =  4

Hence, option (B) is correct.
3
9.98 % of 99.99 × 98.98 + 10.02 =?
» Explain it
D
Making approximation,

10 % of 100 × 99 + 10 = ?

10 × 99 + 10 = ?

990 + 10 =?

? = 1000

Hence, option (D) is correct.
 

4
(20735 × 2808) – (85.01)2 = (?)2 + (6.99)
» Explain it
C
Making approximation,

(20736 × 2809) – (85)2 = (?)2 + 7

(144 × 53) – 7225 = (?)2 + 7

7632 – 7225 = (?)2 + 7

407 = (?)2 + 7

(?)2 = 407 – 7

(?)2 = 400

? = 400

?  = 20

Hence, option (C) is correct.

5
18.952 + ? + 57.004 × 3.023 = 398.998 × 2.003
» Explain it
A
Making approximation,

192 + ? + 57 × 3 = 399 × 2

361 + ? + 171 = 798

? = 798 – 361 – 171

? = 798 – 532

? = 266

Hence, option (A) is correct.