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Approximation Questions and Answers for SBI Clerk Pre 2021, IBPS Clerk, CET, RBI Assistant, LIC at Smartkeeda

Directions: What value will come in place of question mark (?) in the following questions: (You are not expected to calculate the exact value)
1
7(6 - ?) × 119 ÷ √1225 = √289 × 20.98 × 7.03 ÷ 3.02 ÷ 4.95
» Explain it
A
7(6 - ?) × 119 ÷ √1225 = √289 × 20.98 × 7.03 ÷ 3.02 ÷ 4.95
 
7(6 - ?) × 119 ÷ 35 = 17 × 21 × 7 ÷ 3 ÷ 5
 
7(6 - ?) = 17 × 21 × 7 ÷ 3 ÷ 5 ÷ 119 × 35
 
7(6 - ?) = 7 × 7
 
7(6 - ?) = 72
 
6 - ? = 2
 
? = 6 - 2 = 4

Hence, option A is correct.
2
(128.78 + 307.24 + 111.8) – (246.35 – 786.47) = ?2
» Explain it
A
(128.78 + 307.24 + 111.8) – (246.35 – 786.47) = ?2
 
(129 + 307 + 112) – (246 – 786) = ?2
 
548 – (– 540) = ?2
 
?2 = 548 + 540
 
?2 = 1088 ≈ 1089
 
? = 33

Hence, option A is correct.
 
3
54.7% of 1190 ÷ (√676 + ∛ 1728.11 – √361) = ?2 ÷ 57.02
» Explain it
C
54.7% of 1190 ÷ (√676 + ∛ 1728.11 – √361) = ?2 ÷ 57.02
 
1190 × 55/ 100 ÷ (26 + 12 – 19) = ?2 ÷ 57
 
654.5 ÷ 19 = ?2 ÷ 57
 
655 ÷ 19 × 57 = ?2
 
?2  = 655 × 3 = 1965
 
? = 44.32 ≈ 44

Hence, option C is correct.
» Explain it
B

(100 / 1300) × 208 + {(17 × 304) / 323) = ?1/2 +5
 
16 + 16 – 5 = ?1/2
 
?1/2 = 27
 
? = 729 ≈ 730

Hence, option B is correct.
 
5
9.09% of 11.11% of 2430 = ?3 ÷ √289 + √( ∛4096 )
» Explain it
D
9.09% of 11.11% of 2430 = ?3 ÷ √289 + √( ∛4096 )

2430 × (1 / 9) × (1 / 11) = ?3 ÷ 17 + √16

(270 /11) = ?3 ≈ 17 + 4

24.54 – = (?3 / 17)

20.54 = (?3 / 17)
 
21 × 17 = ?3
 
?3 = 357
 
? ≈ 7

Hence, option D is correct.