0
zero added to any addend the sum will equal the same addend. :P
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That is good - but only for addition. there is also the multiplicative identity (1) and other identities for other operators.
Generally, the identity property for a set with a binary operator ~ defined on it is the existence of a unique element of the set, denoted by i, such that for every member of the set, x,
x ~ i = x = i ~ x
It is easy to see that the identity for addition is 0: x + 0 = x = 0 + x for all x
or that the identity for multiplication of numbers is 1: x * 1 = x = 1 * x
But there are other identities in higher mathematics - for example the identity matrix.
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It basically means that you round it up and down. For example 593- 158. For the low estimate the problem would look like this 590-150. For the high estimate the problem would look like this 600-160.
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Which property is demonstrated by this problem 1.7 plus 4.11 plus 6.1 equals 1.7 plus 4.11 plus 6.1?
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