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Approximation Quiz And Download PDF For SBI PO Pre 2021, CET, IBPS PO Pre, SBI Clerk, IBPS Clerk

Direction: What approximate value should come in the place of question mark (?) in the following questions?
1
120.09 ÷ 14.88 × 23.03 – 20.94 × 3.96 = ?
» Explain it
A
? = 120.09 ÷ 14.88 × 23.03 – 20.94 × 3.96

≈ 120 ÷ 15 × 23 – 21 × 4

≈ 8 × 23 – 21 × 4

≈ 184 – 84 ≈ 100

Hence, option A is correct.

2
157.03 × 17.004 – ? ÷ 0.15 = 639.98 × 0.249
» Explain it
B
157.03 × 17.004 – ? ÷ 0.15 = 639.98 × 0.249

⇒  157 × 17 – ? ÷ 0.15 = 640 × 0.25

⇒ 2669 – ? ÷ 0.15 = 640 × (1 / 4) = 160

⇒  ? = (2669 – 160) × 0.15

⇒  ? = 2509 × 0.15 = 376.35  ≈  375

Hence, option B is correct.

3
√624 × √170 × 12.489 ÷ 51.96 = ?
» Explain it
C
? = √624 × √170 × 12.489 ÷ 51.96

? ≈ 25 × 13 × 12.5 ÷ 52

? ≈ 25 × 13 × 12.5 × (1 / 52) ≈ 25 × 3.125 ≈ 78

Hence, option C is correct.

4
839 ÷ 23.99 + 523 ÷ ? + 135.94 – 101.03 = 105
» Explain it
D
839 ÷ 23.99 + 523 ÷ ? + 135.94 – 101.03 = 105

In approximation,

840 ÷ 24 + 523 ÷ ? + 136 – 101 = 105

35 + 523 ÷ ? + 136 – 101 = 105

523 ÷ ? = 105 – 136 + 101 – 35 = 35

? = 523 ÷ 35 ≈ 15

Hence, option D is correct.

5
√325 + √440 × 8 – √841 + √290 – √120 × 12 = ?
» Explain it
A
? = √325 + √440 × 8 – √841 + √290 – √120 × 12

≈ 18 + 21 × 8 – 29 + 17 – 11 × 12

≈ 18 + 168 – 29 + 17 – 132  ≈  42  ≈  40

Hence, option A is correct.