Approximation Test-6 (Approximation of decimal figures)

Answer: Option E

Explanation

Given,

(32.51)²-(17.45)²=?

It can also be approximated as

(32)²-(17)²=?

= (49)×(158)

= 50×15

= 750

Hence, Option E is correct.

Answer: Option C

Explanation

Given,

88.25% of 450= ?% of 530

It can aslo be approximated as,

88% of 450 =?% of 530

= 88×450=?×530

= $\frac{88\times 450}{530}$=? (or) ?= $\frac{3960}{53}$

= 74.71= 75

Hence, Option C is correct.

Answer: Option A

Explanation

Given,

$\sqrt{\text{898}}\times {\text{(12.005)}}^{\text{2}}\text{+? = 5000}$

It can also be approximated as

= $\sqrt{900}\times (12{)}^2+?=5000$

= 30×144+?=5000

= 4320+?=5000

= 5000-4320

= 680

Hence, Option A is correct.

Answer: Option D

Explanation

Given,

3745÷24.05×17.98=?

It can also be approximated as

3750÷25×18=?

By the rule of BODMAS

= 150×18

= 2700 ≈ 2720

Hence, Option D is correct.

Answer: Option D

Explanation

Given,

117.95×8.017×4.98=?

It can also be approximated as

118×8×5=?

?= 118×40 =4720

Hence, Option D is correct