Aptitude - Decimal Fraction - Discussion
Discussion Forum : Decimal Fraction - General Questions (Q.No. 30)
30.
3.87 - 2.59 = ?
Answer: Option
Explanation:
3.87 - 2.59 = (3 + 0.87) - (2 + 0.59)
| = |  |
3 + | 87 |  |
- | |
2 + | 59 | |
| 99 | 99 |
| = 1 + | |
87 | - | 59 | |
| 99 | 99 |
| = 1 + | 28 |
| 99 |
= 1.28.
Discussion:
25 comments Page 2 of 3.
Parth said:
9 years ago
@Nagaraju.
Can we change the signs by opening the brackets as you explained in step 3 above?
Can we change the signs by opening the brackets as you explained in step 3 above?
Nagaraju said:
9 years ago
@Naveen
when 3.87 - 2.59 dot takes place Hundred so simply write 387/100-259/100 but in numerator 87(bar) is their so to less one number in denominator 3.87-2.59.
(3 + 0.87) - (2 + 0.59),
(3 + 87/99) - (2 + 59/99),
3 + 87/99- 2 - 59/99,
Next, step to separate
(3 - 2) + (87/99 - 59/99),
(1) + ((87-59)/99),
1 + (28/99).
Next step comparing with answers all answer in a fraction, so change it as
1.28(bar).
when 3.87 - 2.59 dot takes place Hundred so simply write 387/100-259/100 but in numerator 87(bar) is their so to less one number in denominator 3.87-2.59.
(3 + 0.87) - (2 + 0.59),
(3 + 87/99) - (2 + 59/99),
3 + 87/99- 2 - 59/99,
Next, step to separate
(3 - 2) + (87/99 - 59/99),
(1) + ((87-59)/99),
1 + (28/99).
Next step comparing with answers all answer in a fraction, so change it as
1.28(bar).
Rahul said:
1 decade ago
Very good technique. Thanks to explain.
Akiii said:
1 decade ago
Good technique to solve.
Keerthna said:
1 decade ago
3-2=1.
87-59=28.
3.87-2.59=1.28.
87-59=28.
3.87-2.59=1.28.
Noor said:
1 decade ago
Because upside of that no is power by bar that's why we have to divide by 99.
Thamanna said:
1 decade ago
Why all the numbers are divided by 99?
Narasingarao said:
1 decade ago
3.87 - 2.59 = 1.28.
Why answer is been given so lengthy and complicatedly.
Why answer is been given so lengthy and complicatedly.
Prem said:
1 decade ago
Bar upon the number indicates repeat that number. That is why we divide the number by 99. It's good idea.
Koustubh said:
1 decade ago
For those who are asking that why the numbers are divided by 99. Watch the important formulas section (converting a pure recurring decimal into vulgar fraction).
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