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A is the tens digit and B is the units digit of the produ

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A is the tens digit and B is the units digit of the produ [#permalink] New post 30 Jul 2017, 08:45
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92% (00:34) correct 7% (00:53) wrong based on 106 sessions
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Manager
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Re: A is the tens digit and B is the units digit of the produ [#permalink] New post 25 May 2018, 22:49
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I solved this question by multiplying 45 and 89 and hence got 4005- which has 0 as tenth and 5 as unit digit which is equal to 0 hence A.
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Re: A is the tens digit and B is the units digit of the produ [#permalink] New post 21 May 2019, 09:48
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so if we multiply 12,345 x 6,789=83810205
from there we can identify A=0 and B=5
so A*B=0*5=0
so answer is (A)
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Re: A is the tens digit and B is the units digit of the produ [#permalink] New post 10 Dec 2019, 10:09
IshanGre wrote:
I solved this question by multiplying 45 and 89 and hence got 4005- which has 0 as tenth and 5 as unit digit which is equal to 0 hence A.



Caution: Look at the highlighted word above. Be careful about it, it's tens, not tenth. There is a tremendous difference between tens and tenth.

The number 78.304 has a "7" in the tens place, an "8" in the ones place, a "3" in the tenths place, a "0" in the hundredths place, and a "4" in the thousandths place.
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Re: A is the tens digit and B is the units digit of the produ [#permalink] New post 03 May 2020, 02:34
IshanGre wrote:
I solved this question by multiplying 45 and 89 and hence got 4005- which has 0 as tenth and 5 as unit digit which is equal to 0 hence A.


How do we know that taking just the last 2 digits of each number can give us a reliably correct corresponding units and tens digit for the whole numbers multiplied? Can someone clarify if this is a mathematical property being used?

I used the traditional matrix method for multiplying the two numbers, BUT JUST FOR LAST 2 DIGITS and ignoring the rest.
12345
x6789
______
x x x x 5
x x x 0 0
x x 5 0 0
x 0 0 0 0
__________
x 0 5 0 5
Re: A is the tens digit and B is the units digit of the produ   [#permalink] 03 May 2020, 02:34
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A is the tens digit and B is the units digit of the produ

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