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Most Expected Approximation for IBPS RRB Prelims 2017

Directions (Q. 1-10): What approximate value should come in place of question mark (?) in the following questions? (NOTE : You are not expected to calculate the exact value.)
1. 1504 × 5.865 – 24.091 = ?
1) 7200
2) 9500
3) 6950
4) 5480
5) 8800

2. 16.928 + 24.7582 ÷ 5.015 = ?
1) 35
2) 40
3) 22
4) 12
5) 45

3. ³√7.938 × (6.120)² – 4.9256 = ?
1) 70
2) 55
3) 30
4) 25
5) 90

4. 16.046 ÷ 2.8 × 0.599 = ?
1) 3.5
2) 7.9
3) 1.9
4) 5.6
5) 6.2

5. √963  + (4.895)² – 9.24 = ?
1) 60
2) 35
3) 85
4) 45
5) 25

6. 144.8% of 1339 + 42.02 × 18.484 = ?
1) 2410
2) 2570
3) 2650
4) 2720
5) 2840

7. (3740 ÷ 20.99) × 4.49 = ?
1) 700
2) 800
3) 900
4) 1000
5) 600

8. (2259.6/38.96 × √2020) × 1.24 = ?
1) 3030
2) 3120
3) 3260
4) 3340
5) 3480

9. 184.9% of 749.998 – 114.98% of 839.8 = ?
1) 420
2) 550
3) 590
4) 630
5) 660

10. √24333 – 11.99 × 2.987 = ?
1) 40
2) 80
3) 120
4) 160
5) 200

Answers with Explanations:

1. 5; ? = 1504 × 5.865 – 24.091 = 8820.96 – 24.091 = 8796.869 » 8800
2. 3; ? = 16.928 + 24.7582 ÷ 5.015 = 17 + 25 ÷ 5 = 17 + 5 = 22
3. 1; ³√7.938 × (6.120)² – 4.9256 = 2 × 37.45 – 4.9 = 74.9 – 4.9 = 70
4. 1; ? = 16/2.80 × 0.60 = 96/28 = 3.428 ≈ 3.5
5. 4; ? = √963  + (4.895)² – 9.24 = 31 + 23.04 – 9.24 = 44.04 – 9 = 45.04 ≈ 45
6. 4; ? ≈ 145 × 1340/100 + 42 × 18.5 = 1943 + 777 = 2720
7. 2; ? ≈ 3740/21 × 4.5 = 178 × 4.5 = 801 ≈ 800
8. 3; ? ≈ (2260/39 × √2020) × 1.25 ≈ (57.948 × 44.94) × 1.25 = (58 × 45) × 1.25 = 3262.5 ≈ 3260
9. 1; ? ≈ 185 × 750/100 – 115 × 840/100 = 1387.5 – 966 = 421.5 ≈ 420
10. 3; ? ≈ 156 – 12 × 3 = 156 – 36 = 120
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