## Approximation

#### 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).

1. 21 + 3.7 x 2.9 = ?

1. 21 + 3.7 x 2.9 = ?
? ≈ 21+ 4 x 3

##### Correct Option: D

21 + 3.7 x 2.9 = ?
? ≈ 21+ 4 x 3 ≈ 21 + 12 ≈ 33 ≈ 32

1. 198.001 x 25 + 112.05 x 24.998 = ?

1. ? = 198.001 x 25 + 112.05 x 24.998
= 198 x 25 + 112 x 25

##### Correct Option: D

? = 198.001 x 25 + 112.05 x 24.998
= 198 x 25 + 112 x 25
= 25(198 + 112)
= 25 x 310 = 7750

1. (21 + 99) x (30 - 19.02) = ?

1. (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

1. 17.995 x 16.005 +15.999 x 15.001 = ?

1. ? = 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

1. 3739 + 164 x 27 = ?

1. 3739 + 164 x 27 = ?
? = 3739 + 4428 = 8167

##### Correct Option: C

3739 + 164 x 27 = ?
? = 3739 + 4428 = 8167 ≈ 8200