Approximation Test-5 (Approximation of decimal figures)

Answer: Option C

Explanation

Given,

7999.99+72×49.99=?

It can aslo be approximated as

8000+72×50=?

= 8000+3600

= 11600

Hence, option c is correct.

Answer: Option E

Explanation

Given,

324.995×15.98÷4.002+36.88=?

It can also be approximated as

325×16÷4+37=?

= 325×4+37

= 1300+37

= 1337 ≈ 1340

Hence, Option E is correct.

Answer: Option C

Explanation

Given,

1164×128÷8.008+969.007=?

It can also be approximated as

1164×130÷8+970=?

= 1165×16.25+970

= 18640+970

= 19610 ≈ 19600

Hence, Option C is correct.

Answer: Option A

Explanation

Given,

15.2% of 726× 12.8% of 643=?

It can also be approximated as

15% of 725× 13% of 643=?

= $\frac{15}{100}$×725×$\frac{13}{100}$×643

= 15×7.25×13×6.43

= 15×7.25×13×6.5

= 195×7.25×6.5

= 9189.375 ≈ 9110

Hence, Option A is correct.

Answer: Option B

Explanation

Given,

(36.14)²-(21.28)²=?

It can also be approximated as

(36)²-(21)²=?

= 1296-441

= 855 ≈ 853

Hence, Option B is correct.