Approximation Test-3 (Approximation of decimal figures)

Answer: Option D

Explanation

Given,

423.62-269.21÷(11.9% of 78)=?

It can be approximated as

425-270÷(12% of 80)=?

= $425-270÷\left(\frac{12\times 80}{100}\right)=?$

= 425-270÷10

= 425-27

= 398 ≈ 395

Hence, Option D is correct.

Answer: Option C

Explanation

Given,

17.99²-14.05²+(2343.75+81.55)÷?

It can be approximated as

(18)²-(14)²+(2343.75+80)÷?=230

= 324-196+2430÷?=230

= 2430÷?=230-130

= 2430÷100

=24.3 ≈ 24

Hence, Option C i correct.

Answer: Option C

Explanation

Give,

12.95×7.05+85.01²×10.99=?

It can be approximated as

13×7+85²×11=?

= 91+7225×11

= 91+79200

= 79300 ≈ 79566

Hence, Option C is correct.

Answer: Option B

Explanation

Given,

(13.000)³=?

It can be approximated as

(13.000)³=?

= (13)³=?

= 2197 ≈ 2200

Hence, Option B is correct.

Answer: Option A

Explanation

Given,

50.001% of 99.99÷50=?

It can be approximated as

50% of 100÷50=?

= 50% of 2  [applying the BODMAS]

= $\frac{1}{2}\times 2$

=1

Hence, Option A is correct.