# How do I substract or add a number with a plus or minus sign?

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Thread starter 4 years ago
#1
This is actually a biology calculation question,

but anyway, how do I subtract or add numbers that have a ± sign next to them?
For eg. (343 ± 36 - 192 ± 37) or (343 ± 36 + 192 ± 37)
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4 years ago
#2
(Original post by Adorable98)
This is actually a biology calculation question,

but anyway, how do I subtract or add numbers that have a ± sign next to them?
For eg. (343 ± 36 - 192 ± 37) or (343 ± 36 + 192 ± 37)
That could mean a few things especially if this is a science question.

Can you post the whole question or at least the context of the question?
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Thread starter 4 years ago
#3
(Original post by notnek)
That could mean a few things especially if this is a science question.

Can you post the whole question or at least the context of the question?
So we are told to use manipulation of data to support our answer!
But the problem was I couldn't manipulate them!

The manipulation has been calculated is in the last table below (from the markscheme), But I don't know how they've calculated it?

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4 years ago
#4
You do the calculation twice; once using the plus number, once using the minus number.
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4 years ago
#5
Ignore the +/- number, it's just the uncertainty of the Tensile strength. If you were to subtract them properly you'd get an answer along with its uncertainty but I can't imagine you're expected to calculate that.
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Thread starter 4 years ago
#6
Bump! Bump! Bump!!!
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4 years ago
#7
Just do both in turn

Posted from TSR Mobile
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Thread starter 4 years ago
#8
(Original post by GodOfTraingles)
Just do both in turn

Posted from TSR Mobile
I tried..I don't seem I could get the answer!
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