Approximation Test-7 (Complete Revision)

Answer: Option E

Explanation

Given,

459% of 849.947 + 266% of 6284.012 -1486.002 =?

It can also be approximated as

460% of 850+265% of 6285-1486

= 3910+16655-1486

= 19079 ≈ 19130

Hence, Option E is correct.

Answer: Option A

Explanation

Given,

(399.98)²=?

It can also be approximated as

= (400)²

= 160000

Hence, Option A is correct.

Answer: Option C

Explanation

Given,

$\begin{array}{l}\sqrt{\text{624.9995}}{\text{ + (4.9989)}}^{\text{2}}\\ =?÷\frac{1}{\text{4.9900865}}\end{array}$

It can also be written as

 $$\begin{gathered} = \sqrt{625}+(5{)}^2?+\frac{1}{5} \\ =?\approx \frac{1}{5}(25+25) \\ = 0.2\times 50 \\ =10 \end{gathered}$$

Hence, Option Cis correct.

Answer: Option C

Explanation

Given,

989.001+1.00982×76.792=?

It can also be approximated as 

= 990+1×76.8

= 1066.8 ≈ 1065

Hence, Option C is correct.

Answer: Option E

Explanation

Given,

(15.96)²+75% of 285=?

It can also be approximated as

$= {\left(16\right)}^2+\frac{17}{100}\times 285$

= 256+213.75

= 469.75 ≈ 470

Hence, Option E is correct.