Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 5)
5.
1397 x 1397 = ?
Answer: Option
Explanation:
| 1397 x 1397 | = (1397)2 |
| = (1400 - 3)2 | |
| = (1400)2 + (3)2 - (2 x 1400 x 3) | |
| = 1960000 + 9 - 8400 | |
| = 1960009 - 8400 | |
| = 1951609. |
Discussion:
55 comments Page 6 of 6.
Malik said:
1 decade ago
Can someone make me understand this line = (1400)2 + (3)2 - (2 x 1400 x 3) ?
Abi said:
1 decade ago
Hai tamil, your explanation is nice.
G.M.L.GENATUS said:
1 decade ago
Just take a nearest whole value.
Jay vaghela said:
1 decade ago
Where is come form 1400 ?
Tamil said:
1 decade ago
If you want to multip[ly the theis type of big no follow the step:
1397 * 1397=?
1397*1400=1955800
and (1397+3=1400) so 1397*3=4191
1955800-4191=1951609
another example:
234*52
you can take 234*50=11700
and (52-2=50) so 234*2=468
11700+468=12168
1397 * 1397=?
1397*1400=1955800
and (1397+3=1400) so 1397*3=4191
1955800-4191=1951609
another example:
234*52
you can take 234*50=11700
and (52-2=50) so 234*2=468
11700+468=12168
(1)
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