Approximation
Direction: What approximate value should come in place of the question mark(?) in the following question ? (Note that you are not expected to calculate the exact value).
 21 + 3.7 x 2.9 = ?

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21 + 3.7 x 2.9 = ?
? ≈ 21+ 4 x 3Correct Option: D
21 + 3.7 x 2.9 = ?
? ≈ 21+ 4 x 3 ≈ 21 + 12 ≈ 33 ≈ 32
 198.001 x 25 + 112.05 x 24.998 = ?

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? = 198.001 x 25 + 112.05 x 24.998
= 198 x 25 + 112 x 25Correct Option: D
? = 198.001 x 25 + 112.05 x 24.998
= 198 x 25 + 112 x 25
= 25(198 + 112)
= 25 x 310 = 7750
 (21 + 99) x (30  19.02) = ?

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(21+ 99) x (30  19.02)
≈(21+ 99 ) x (30  19)Correct Option: D
(21+ 99) x (30  19.02)
≈ (21+ 99 ) x (30  19)
≈ 120 x 11 = 1320
 17.995 x 16.005 +15.999 x 15.001 = ?

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? = 17.995 x 16.005 + 15.999 x 15.001
= 18 x 16 + 16 x 15 = 16 x (18 + 15)Correct Option: B
? = 17.995 x 16.005 + 15.999 x 15.001
= 18 x 16 + 16 x 15 = 16 x ( 18 + 15)
= 16 x 33 = 528
 3739 + 164 x 27 = ?

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3739 + 164 x 27 = ?
? = 3739 + 4428 = 8167Correct Option: C
3739 + 164 x 27 = ?
? = 3739 + 4428 = 8167 ≈ 8200