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2014-06-29T15:12:13+08:00

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The integers consist of positive and negative

in adding integers you must give importance to the sign:

examples:

1. 1+1 = 2
2. -1+-1= -2

if there has a different sign but same in number the sum is ZERO

examples:
1. -10 + 10 = 0

if there has a differ. sign but differ. also in number you mus subtract it and the number that has the greatest value that will be the sign:

examples
1.  -10 + 9 = -1
2. -15 +25 = 10

>>Hope it helps..
dont copy my answer or delete it is originally based it on my mind!!

from: TaengPark

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2014-06-29T15:27:38+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The signed numbers are all part of the integers. 
Positive numbers and negative numbers are the signed numbers.
When adding integers, for example -30+18=?, you look at the numbers, find out which number has a bigger absolute value (in this case it's -30), subtract like whole numbers (30-18=12) and then the sign of the number which has the bigger absolute value will be used.
So, -30+18=-12
When subtracting integers:
Ex. -20-5=?
You change the subtraction sign to the addition sign and then you make the 5 to -5.
So, it will be -20+-5=-25
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