Tuesday, July 13, 2010

Subtracting integers


let us study about Integers,
n number theory, a partition of a positive integer n is a way of writing n as a sum of positive integers. Two sums which only differ in the order of their summands are considered to be the same partition; if order matters then the sum becomes a composition. A summand in a partition is also called a part. The number of partitions of n is given by the partition function p(n).

I know how to subtract integers

To subtract integers, rewrite as adding opposites and use the rules for addition of integers.

Recall that rules for addition of integers is:

Rule 1:

The sum of two or more positive integers is a positive integer.
The sum of two or more negative integers is a negative integer.

Rule 2:

To find the sum of a positive and a negative integer:
Subtract the two numbers (ignore the signs) and then keep the sign of the larger integer.

Example:

9 -14 = 9 + (-14) = -5

-12 - 6 = -12 + (-6) = -18

-10 - (-7) = -10 + (- - 7) = -10 + 7 = -3

I hope the above explanation was helpful.

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