Very basic but frustrating problem: piece of specialized cardboard which is 187 x 97

Garth

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May 2, 2018
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I am having issues working out a seemingly very basic problem.

I have a piece of specialized cardboard which is 187 x 97mm and I have to order more.
I need 10 of these pieces per work item I have to make.
So I would think 10 x 187 and 97 = 1813900mm
But if I measure the sample roll where I have marked out the individual pieces it measures 500x380mm which equals 190000.

Why do they come to different values?

Thank you,
Garth:confused:
 
I am having issues working out a seemingly very basic problem.

I have a piece of specialized cardboard which is 187 x 97mm and I have to order more.
I need 10 of these pieces per work item I have to make.
So I would think 10 x 187 and 97 = 1813900mm
But if I measure the sample roll where I have marked out the individual pieces it measures 500x380mm which equals 190000.

Why do they come to different values?

Thank you,
Garth:confused:

Waste.

380 = (187 * 2) + 6 -- It's that "+6" that's much of the difference.
500 = (97 * 5) + 15 -- It's that "+15" that's much of the difference.
There is also a small piece, 6 x 15 that explains the rest.

You just have to decide what to do with your extra 3 pieces:
6 x 485
15 x 380
6 x 15
 
I am having issues working out a seemingly very basic problem.

I have a piece of specialized cardboard which is 187 x 97mm and I have to order more.
I need 10 of these pieces per work item I have to make.
So I would think 10 x 187 and 97 = 1813900mma
You have an extra 0: 10 x 187 x 97= 181390. And this is an area in square mm not mm.

But if I measure the sample roll where I have marked out the individual pieces it measures 500x380mm which equals 190000.

Why do they come to different values?

Thank you,
Garth:confused:
 
I am having issues working out a seemingly very basic problem.

I have a piece of specialized cardboard which is 187 x 97mm and I have to order more.
I need 10 of these pieces per work item I have to make.
So I would think 10 x 187 and 97 = 1813900mm
But if I measure the sample roll where I have marked out the individual pieces it measures 500x380mm which equals 190000.

Why do they come to different values?

Thank you,
Garth:confused:
As HallsofIvy already pointed out you have an extra zero. I saw this immediately and I'll tell you the secret. Since 7*7 ends in a 9, it will also be true that 187*97 will end in a 9. Now when you multiply a number that ends in 9 by 10 it will end in 90, not 00 or 900.
 
As HallsofIvy already pointed out you have an extra zero. I saw this immediately and I'll tell you the secret. Since 7*7 ends in a 9, it will also be true that 187*97 will end in a 9. Now when you multiply a number that ends in 9 by 10 it will end in 90, not 00 or 900.


Thats a really helpful tip Jomo, thank you. Im sure there are many people to whom like me, maths just doesnt compute in our minds, its a challenge for me to add 2 digit numbers together and the above simple problem had me tearing my hair out.
 
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