Decimal Calculation Shortcut for Competitive Exams
Question
What is 43.4 − 23.6 + 20.6 − 17.4 ?
(A) 30.2 (B) 32 (C) 19.8 (D) 12
Step-by-Step Solution
43.4 − 23.6 = 19.8
19.8 + 20.6 = 40.4
40.4 − 17.4 = 23.0
19.8 + 20.6 = 40.4
40.4 − 17.4 = 23.0
Shortcut Method (Best for Exams)
(43.4 + 20.6) − (23.6 + 17.4)
= 64.0 − 41.0
= 23.0
= 64.0 − 41.0
= 23.0
✔ Correct Mathematical Answer = 23
Important Exam Note:
The correct answer 23 is not given in the options.
This indicates a printing / option error.
In real examinations, such questions are usually:
The correct answer 23 is not given in the options.
This indicates a printing / option error.
In real examinations, such questions are usually:
- Dropped
- Given grace marks
- Corrected officially
Quick Decimal Exam Tip
✔ Pair numbers ending with .4 and .6
✔ Rearranging saves time and avoids mistakes
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