Answers

2016-07-19T20:08:18+08:00
1. like signs will be added and copy the common sign
2. unlike signs will be subtracted and copy the greater sign of the absolute number.
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2016-07-19T20:32:07+08:00
This is the common mistake in adding integers...
some are getting confused of its ruling:

please remember when subtracting a negative numbers..
1.) please change the sign of the subtrahend and proceed adding, and copy the sign who has a greater value.
2.) ex.. -2 - (-4)= multiply  the two signs as written like this, -2+4=2;
             2-(-4)= 2+4=6
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