   Directions: What value will come in place of question mark (?) in the following questions: (You are not expected to calculate the exact value)
Important for :
1
(1611.23 + 2113.03 – 923.98) ÷ 3.98 × 2 = ? + 99
» Explain it
A
(1611.23 + 2113.03 – 923.98) ÷ 3.98 × 2 = ? + 99

 ≈ 1611 + 2113 – 924 × 2 = ? + 99 4

 3724 – 924 = ? + 99 2

 2800 = ? + 99 2

? = 1400 – 99

? = 1301 ≈ 1300

Hence, option A is correct.

2
1370 + 1763.9 × 3 ÷ 21 = ?3 + 15
» Explain it
D
1370 + 1763.9 × 3 ÷ 21 = ?3 + 15

≈  1369 + 1764 × 3 ÷ 21 = ?3 + 15

37 + 42 ÷ 7 = ?3 + 15

37 + 6 – 15 = ?3

?3 = 28

? = 3.04 ≈ 3

Hence, option D is correct.
3
(14.98)2 + (12.01)2 – (10.98)2 = ? + 95 ÷ 5
» Explain it
C
(14.98)2 + (12.01)2 – (10.98)2 = ? + 95 ÷ 5

≈ 152 + 122 – 112 = ? + 19

225 + 144 – 121 – 19 = ?

? = 369 – 140

? = 229 ≈ 230

Hence, option C is correct.

4
89.9% of 900 – ?2 – 20% of 400.01 = 420 – 10.98
» Explain it
A
89.9% of 900  – ?2 – 20% of 400.01 = 420 – 10.98

≈ 90% of 900 – ?2 – 20% of 400 = 420 – 11

810 – ?2 – 80 = 409

?2 = 810 – 409 – 80

?2 = 321

? = 17.91 ≈ 18

Hence, option A is correct.

5
(20.1 × 17.97) ÷ (16 × 14.98) + 16.09 + 2 × 1.50 = ?
» Explain it
E
(20.1 × 17.97) ÷ (16 × 14.98) + 16.09 + 2 × 1.50 = ?

? ≈ (20 × 18) ÷ (16 × 15) + 16 + 2 × 1.5

 20 × 18 + 16 + 3 = ? 16 × 15

 360 + 19 = ? 240

1.5 +19 = ?

? = 20.5 ≈ 20

Hence, option E is correct.