## 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. 421 x 0.9 +130 x 101 + 10000 = ?
1. 33500
2. 23500
3. 225000
4. 24500

1. ? = 421 x 0.9 +130 x 101 x 10000
= 378.9 + 13130 +10000

##### Correct Option: B

? = 421 x 0.9 +130 x 101 x 10000
= 378.9 + 13130 +10000
= 23508.9 ≈ 23500

1. 30.9 x 3000 - 10.1 x 1100 + 8298- 4302 = ?
1. 80000
2. 90000
3. 105000
4. 85000

1. ? = 30.9 x 3000 -10.1 x 1100 + 8298 - 4302
= 92700 - 11110 + 8298 - 4302

##### Correct Option: D

? = 30.9 x 3000 -10.1 x 1100 + 8298 - 4302
= 92700 - 11110 + 8298 - 4302
= 92700 - 11110 + 8298 - 4302
= 85586 ≈ 85000

1. 56.001 x ? - 1000.999 = 231
1. 22
2. 45
3. 37
4. 16

1. 56.001 x ? - 1000.999 = 231
⇒ 56 x ? - 1001 = 231

##### Correct Option: A

56.001 x ? - 1000.999 = 231
⇒ 56 x ? - 1001 = 231
⇒ 56 x ? = 231 +1001 = 1232/56 = 22

1. 1010 ÷ 36+187 x 20.05 = ?
1. 3650
2. 3770
3. 3825
4. 3800

1. b ? = 1010 ÷ 36 + 187 x 20.05
= 28.0555 + 3749.35

##### Correct Option: B

b ? = 1010 ÷ 36 + 187 x 20.05
= 28.0555 + 3749.35 = 3777.40 ≈ 3770

1. 724 ÷ 25 x 31.05 + 101 = ?
1. 900
2. 1000
3. 950
4. 1050

1. 724 ÷ 25 x 31.05 + 101 = ?
⇒ ? = 725 ÷ 25 x 31 + 101

##### Correct Option: B

724 ÷ 25 x 31.05 + 101 = ?
⇒ ? = 725 ÷ 25 x 31 + 101
= 29 x 31+ 101
= 899 + 101 = 1000