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clciotola
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 08:41
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

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5% (low)

Question Stats:

88% (00:25) correct 12% (00:43) wrong based on 144 sessions

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What is the units digit of (493) (915) (381) (756) (29)

A. 0
B. 1
C. 4
D. 5
E. 6
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A
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SrinathVangala
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 08:45
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clciotola
what is the units digit of (493) (915) (381) (756) (29)


a 0
b 1
c 4
d 5
e 6


any help to solve this in a fast way?

thank you!
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I think the answer is A

If you observe the numbers we have a 5 and a two in the factors. If you multiply we will always get a zero in the units place no matter what the other numbers are.

Is this a official question?
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coolpintu
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 08:48
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Just multiply the digits in the units place for each term and you will get the answer. It should be 0. you got a 5 as a unit digit and an even number term. so the multiplication of this will definitely yield a 0. Answer has to be 0.
I also tried it using the calculator and the answer is 0.

IMO A.
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clciotola
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 08:50
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clciotola
what is the units digit of (493) (915) (381) (756) (29)


a 0
b 1
c 4
d 5
e 6


any help to solve this in a fast way?

thank you!


I think the answer is A

If you observe the numbers we have a 5 and a two in the factors. If you multiply we will always get a zero in the units place no matter what the other numbers are.

Is this a official question?
Show more


the answers is E it's an official question!
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coolpintu
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 08:52
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Can you please post the source and if possible the official explanation?
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clciotola
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 08:53
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coolpintu
Can you please post the source and if possible the official explanation?
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i don't have, i will try to ask to my teacher
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 16:07
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It is definitely A ... 0 .... U VE EVEN NUMBERS AND NUMBERS ENDING WITH 5 ... ... CHECK WITH A CALCULATOR
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BengalScientist
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What is the units digit of (493) (915) (381) (756) (29) 14 May 2013, 18:01
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SrinathVangala
clciotola
what is the units digit of (493) (915) (381) (756) (29)


a 0
b 1
c 4
d 5
e 6


any help to solve this in a fast way?

thank you!


I think the answer is A

If you observe the numbers we have a 5 and a two in the factors. If you multiply we will always get a zero in the units place no matter what the other numbers are.

Is this a official question?
Show more

I answered A, but itsays E. I checked with a calculator, it ends with 0.

Can the admin change the answer to A from E.
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clciotola
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What is the units digit of (493) (915) (381) (756) (29) 16 May 2013, 06:00
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SrinathVangala
clciotola
what is the units digit of (493) (915) (381) (756) (29)


a 0
b 1
c 4
d 5
e 6


any help to solve this in a fast way?

thank you!


I think the answer is A

If you observe the numbers we have a 5 and a two in the factors. If you multiply we will always get a zero in the units place no matter what the other numbers are.

Is this a official question?

I answered A, but itsays E. I checked with a calculator, it ends with 0.

Can the admin change the answer to A from E.
Show more

Guys the official answer is the A!
but i still have problem to understand can you plese post the calculation step by step? thank you in advance
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SrinathVangala
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What is the units digit of (493) (915) (381) (756) (29) 16 May 2013, 07:51
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Hi clciotola..

(493)(915)(381)(756)(29)


For example .....

lets take \(13 * 15\) ...

we get 195.... You can see that If you multiply any odd number with 5 the units digit of the result will be 5.Why?
The last digit oof the odd number will be one of 1, 3, 5,7,9. If you multiply any of these digits with 5 you will get 5 as the units digit in the result.

Now lets take another example with an even number. take 12 * 15.

It is 180. Now 12 can be written as 2*6.Multiply 2 with 15 you will get 30.Now no matter what you multiply 30 with you will always get 0 in the units place.

So any even number when multiplied by 5 will give a result with 0 in the units place.

Lets get back to the question. If we muliptly 493 ,381 and 29 we will get an odd number

Let this result be x. so x is odd

If x is multiplied with an even number the result will be even right??(odd*even = even)

lets multiply x with 756. The result will be even.

Let this result be Y.


Now Y is an even number and you have to multiply it with 15. 15 has 5 in it.So the last digit in the result will be 0.

Hope this helps
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clciotola
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What is the units digit of (493) (915) (381) (756) (29) 16 May 2013, 08:05
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SrinathVangala
Hi clciotola..

(493)(915)(381)(756)(29)


For example .....

lets take \(13 * 15\) ...

we get 195.... You can see that If you multiply any odd number with 5 the units digit of the result will be 5.Why?
The last digit oof the odd number will be one of 1, 3, 5,7,9. If you multiply any of these digits with 5 you will get 5 as the units digit in the result.

Now lets take another example with an even number. take 12 * 15.

It is 180. Now 12 can be written as 2*6.Multiply 2 with 15 you will get 30.Now no matter what you multiply 30 with you will always get 0 in the units place.

So any even number when multiplied by 5 will give a result with 0 in the units place.

Lets get back to the question. If we muliptly 493 ,381 and 29 we will get an odd number

Let this result be x. so x is odd

If x is multiplied with an even number the result will be even right??(odd*even = even)

lets multiply x with 756. The result will be even.

Let this result be Y.


Now Y is an even number and you have to multiply it with 15. 15 has 5 in it.So the last digit in the result will be 0.

Hope this helps
Show more


thank you very nice!! just the stal question when you say "Lets get back to the question. If we muliptly 493 ,381 and 29 we will get an odd number" multiply by what??
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SrinathVangala
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What is the units digit of (493) (915) (381) (756) (29) 16 May 2013, 08:07
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493*381*29 = odd number
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BengalScientist
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What is the units digit of (493) (915) (381) (756) (29) 23 May 2013, 14:04
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SrinathVangala
Hi clciotola..

(493)(915)(381)(756)(29)


For example .....

lets take \(13 * 15\) ...

we get 195.... You can see that If you multiply any odd number with 5 the units digit of the result will be 5.Why?
The last digit oof the odd number will be one of 1, 3, 5,7,9. If you multiply any of these digits with 5 you will get 5 as the units digit in the result.

Now lets take another example with an even number. take 12 * 15.

It is 180. Now 12 can be written as 2*6.Multiply 2 with 15 you will get 30.Now no matter what you multiply 30 with you will always get 0 in the units place.

So any even number when multiplied by 5 will give a result with 0 in the units place.

Lets get back to the question. If we muliptly 493 ,381 and 29 we will get an odd number

Let this result be x. so x is odd

If x is multiplied with an even number the result will be even right??(odd*even = even)

lets multiply x with 756. The result will be even.

Let this result be Y.


Now Y is an even number and you have to multiply it with 15. 15 has 5 in it.So the last digit in the result will be 0.

Hope this helps
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(493) (915) (381) (756) (29)

Take 915 * 756, one has 6 and the other has 5 in units place. it will yield 0 (when multiplied 6*5 =30) at the end. Any number when multiplied with 10, 20, 30...100 would yield 0 in units place that is the case for this example.
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JUNENTW
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What is the units digit of (493) (915) (381) (756) (29) 30 Dec 2020, 03:46
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from the question 756 * 915 = end with Zero since 6*5= 30
so the whole calculation must end with 0
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