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basic quant

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kanusha
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basic quant [#permalink] New post   17 Jan 2014, 04:34
hii bunnel :)
to know some basics iam seeing cbse maths books, so i have one doubt

does subtraction is associative with natural numbers?? its not
as per analysis with example a-(b-c) # ( a-b) - c

but i want to know is it right or wrong becz in cbse 8ths maths it is stating as associative for subtraction
pls clarify even though its silly bunnel

thank you



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Re: basic quant [#permalink] New post   17 Jan 2014, 04:42
hiiiii.... :)

ZERO
why zero is called as identity for the additional of rational numbers? and
also why it is also a additive identity of whole numbers and integers?

one thing i know about zero is , if it is used as an operation to any number , the result is the same number ex: in add, subtraction
ex: a+0 = 0+a = a

these points u have read in cbse 8th class ,
can anyone clear this point pls

thank you
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Re: basic quant [#permalink] New post   17 Jan 2014, 04:58
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Subtraction is not associative with natural number.

a-(b-c) = a - b +c
( a-b) - c= a - b -c
Clearly not the same
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Re: basic quant [#permalink] New post   22 Jan 2014, 00:40
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kanusha wrote:
hiiiii.... :)

ZERO
why zero is called as identity for the additional of rational numbers? and
also why it is also a additive identity of whole numbers and integers?

one thing i know about zero is , if it is used as an operation to any number , the result is the same number ex: in add, subtraction
ex: a+0 = 0+a = a

these points u have read in cbse 8th class ,
can anyone clear this point pls

thank you


a +0 = 0+a = a is exactly why 0 is additive identify for whole numbers, integers and rational numbers.

Similarly, 1 is the multiplicative identiy. a * 1 = 1 * a = a.



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Re: basic quant [#permalink]
22 Jan 2014, 00:40
Moderator:
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