Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 40)
40.
(12345679 x 72) = ?
Answer: Option
Explanation:
| 12345679 x 72 | = 12345679 x (70 +2) |
| = 12345679 x 70 + 12345679 x 2 | |
| = 864197530 + 24691358 | |
| = 888888888 |
Discussion:
19 comments Page 1 of 2.
Sindhiya Mary KV said:
3 months ago
Thanks for giving explanations.
Jaga said:
4 years ago
@Krishna.
Given number is 12345679 not 123456789.
Given number is 12345679 not 123456789.
(3)
Jaga said:
4 years ago
@Krishna.
Given number is 12345679 not 123456789.
Given number is 12345679 not 123456789.
Krishna said:
4 years ago
@Kumar
123456789 * 9 = 1111111101, then how do you get 111111111? Explain.
123456789 * 9 = 1111111101, then how do you get 111111111? Explain.
Kamalesh said:
5 years ago
Nice, thanks @Anagha.
Ronit Singh said:
6 years ago
Why the hell you are applying these lengthy methods, just multiply last three digit i.e. 672 with 72 and you will see 8888 as the last 4 digit in the result and in option only A & B options are with 8888. So option B is the answer as when we multiply a 8 digit long number with two digit number then answer can not be in 8 digit long number. So answer is option B.
(4)
Swapnil Dalvi SD said:
6 years ago
Thanks @Kumar.
(1)
Kumar said:
7 years ago
12345679 * 72.
= 12345679*(9*8).
= 12345679*(10-1)*8.
= (123456790-12345679)*8.
= 11111111*8.
= 88888888.
= 12345679*(9*8).
= 12345679*(10-1)*8.
= (123456790-12345679)*8.
= 11111111*8.
= 88888888.
(9)
JAISON said:
8 years ago
12345679 x (70+2).
12345679 x 70 = 864197530,
12345679 x 2 = 24691358,
864197530 + 24691358 = 888888888.
12345679 x 70 = 864197530,
12345679 x 2 = 24691358,
864197530 + 24691358 = 888888888.
Kiran said:
9 years ago
Yes, Checking with divisibility rules is easy.
(1)
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