Approximation Test-2 (Rounding off to Integers)

Answer: Option C

Explanation

Given,

(47% of 1442-36% of 1412)÷ 63=?

It can be approximated as

(50% of 1400-40% of 1400)÷ 60=?

$= \left(\frac{1}{2}\times 1400-\frac{40}{100} of 1400\right)$

= 700-40×14

= 700-560÷60

= 140÷60

=2.5 ≈ 3

Hence, option C is correct.

Answer: Option E

Explanation

Given, 

(341789+265108)÷(8936-3578)= ?

It can be approximated as

(300000+200000)÷(9000-4000)= ?

= 600000÷5000

= 120 ≈125

Hence, Option E is correct.

Answer: Option B

Explanation

Given,

29% of 725 = 60% of 315 + ?

It can be appoximated as

30% of  700 = 60% of 315 + ?

$= \frac{30}{100}\times 700=\frac{60}{100}\times 300+?$

 = 210=180+?

 = 210-180

 = 30

Hence, Option B is correct.

Answer: Option C

Explanation

Given,

$\begin{array}{l}\sqrt{\text{598746}}_3\text{ =?}\end{array}$

It can be approximated as

$$\begin{gathered} \sqrt[3]{600000} \\ \begin{array}{l}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}?=}\sqrt{600\times 1000}_3=\sqrt{512\times 1000}_3\end{array} \\ \begin{array}{l}?=\sqrt{8\times 8\times 8\times 10\times 10\times 10}_3\\ \downarrow \downarrow \\ 810\end{array} \end{gathered}$$

= 8×10

= 80 ≈ 84

Hence, Option C is correct.

Answer: Option B

Explanation

Given,

$\text{125\% of 605 +}\frac{4}{5}\mathrm{of}218=?$

It can be approximated as

$\text{125\% of 600 +}\frac{4}{5}\mathrm{of}200=?$

$= \frac{\text{125}}{100}\text{× 600 +}\frac{4}{5}\text{ × }200=?$

= 750+160

= 910 ≈ 931

Hence, option B is correct.