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Directions:(1-10) **What approximate value will come in place of question mark (?) in the following questions? (You are not expected to calculate the exact value.)**

1. 27.05 x 24.96 + 38.94 x 64.01 + 21.97 x 30.06 = ? x 25.98 + 9.04

2. 89.97/3.04– 7.03 x 14.99 + ∛125.02 = ?

3. 40% of 2648 + 35% of 1823 = 50% of ?

4. 458 x 15 – 651 x 17 + 519 x 13 = ?

5. 5163.3453 – 4018.9025 + 3209.2355 – 3146.8554 + 1873.3463 – 718.534 = ?

6. 4830 ÷ 34 x 13 – 61.13 x 26.89 = ?

7. √1199 + √1299 + √1399 + √1499 + √1599 = ?

8. 36 x 47 + 43 x 52 – 77 x 23 = ? x (6)^{3}

9. √1156.1 + √2601.11 – √3363.91 = ?

10. ∛6858.44 – ∛25.81 – ∛10648.79 = ?

**Check your Answers below:**

Directions:(1-10) **What approximate value will come in place of question mark (?) in the following questions? (You are not expected to calculate the exact value.)**

##### 1. Question

27.05 x 24.96 + 38.94 x 64.01 + 21.97 x 30.06 = ? x 25.98 + 9.04

? x 26 ≈ 27 x 25 + 39 x 64 + 22 x 30 – 9

? x 26 = 675 + 2496 + 660 – 9

? x 26 = 3822

? = 3822/26 = 147

##### 2. Question

? ≈ (90/3) – 7 x 15 + ∛125

= 30 – 105 + 5

=-70

##### 3. Question

40% of 2648 + 35% of 1823 = 50% of ?

0.5 x ? ≈ 0.4 x 2650 + 0.35 x 1820

= 1060 + 637 = 1697

=> ? = 3394 ≈ 3400

##### 4. Question

458 x 15 – 651 x 17 + 519 x 13 = ?

? = 460×15 – 650×17 + 520×13

= 6900 – 11050 + 6760

= 2610 ≈ 2550

##### 5. Question

5163.3453 – 4018.9025 + 3209.2355 – 3146.8554 + 1873.3463 – 718.534 = ?

? ≈ 5160 – 4020 + 3210 – 3150 + 1870 – 720

= (5160+3210+1870) – (4020+3150+720) = 10240 – 7890 = 2350 ≈ 2360

##### 6. Question

4830 ÷ 34 x 13 – 61.13 x 26.89 = ?

? ≈ 142 x 13 – 61 x 27

= 1846 – 1647 = 199 ≈ 200

##### 7. Question

√1199 + √1299 + √1399 + √1499 + √1599 = ?

? ≈ √1200 + √1300 + √1400 + √1500 + √1600

= 34.64 + 36.05 + 37.42 + 38.73 + 40

= 186.84 ≈ 185

##### 8. Question

36 x 47 + 43 x 52 – 77 x 23 = ? x (6)^{3}

? x 216 = 1692 + 2236 – 1771 = 2157

=> ? ≈ 10

##### 9. Question

√1156.1 + √2601.11 – √3363.91 = ?

34

^{2}= 1156, 51

^{2}= 2601, 58

^{2}= 3364

? ≈ √1156 + √2601 – √3364

= 34 + 51 – 58 = 27

##### 10. Question

∛6858.44 – ∛25.81 – ∛10648.79 = ?

19

^{3}= 6859, 3

^{3}= 27, 22

^{3}= 10648

? ≈ ∛6859 – ∛27 – ∛10648

= 19 – 3 – 22 = -6