Direction: What approximate value should come in place of question mark.
Important for :
1
√578 × √1297 + (23 / 100) × 456 = ?
» Explain it
C
√578 × √1297 + (23 / 100) × 456 = ?

? = 24.01 × 36.01 + 104.88

? ≈ 24 × 36 + 105

∴ ? ≈  969

Hence, option C is correct.

2
12.15 × 24.8 × ? = 4556.8 + 56.2
» Explain it
A
12.15 × 24.8 × ? = 4556.8 + 56.2

= 12 × 25 × ? = 4557 + 56

⇒ 300 × ? = 4613

⇒ ? = (4613 / 300)

⇒ ? = 15.37

⇒ ? ≈ 15

Hence, option A is correct.

3
(4 / 5) × (6 / 7) × (23 / 4) × (56 / 5) × 789.89 = ?
» Explain it
D
(4 / 5) × (6 / 7) × (23 / 4) × (56 / 5) × 789.89 = ?

? = (4 / 5) × (6 / 7) × (23 / 4) × (56 / 5) × 789.89

? ≈ (4 / 5) × (6 / 7) × (23 / 4) × (56 / 5) × 790

? = 34886.4

? ≈ 34886

Hence, option D is correct.

4
(13456.965 / 9.98) + (36.21 + √1226.5) = ?
» Explain it
B
(13456.965 / 9.98) + (36.21 + √1226.5) = ?

? ≈ (13457 / 10) + (36 + 35.02)

? ≈ 1345.7 + 71.02

? ≈ 1346 + 71

? ≈ 1417

Hence, option B is correct.

5
(7.04)2 + (6.98)3 + 567.123 – (4.12)4 = ?
» Explain it
C
(7.04)2 + (6.98)3 + 567.123 – (4.12)4

? ≈ (7)2 + (7)3 + 567 – (4)4

= 49 + 343 + 567 – 256

= 703

Hence, option (C) is correct.