Answers

2014-08-07T21:21:00+08:00
1+3= 4
1+(-3)= -2
-1+3= 2
-1+(-3)= -4
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2014-08-07T22:25:29+08:00
If the two given are unlike signs (positive and negative) you subtract and the sign of the difference will depend to the sign of the number which has the larger absolute value. example, -31 + 6= 31-6= 25, |-31| = 31, |6|= 6 31>6 so we copy the sign of -31 which is negative. Therefore -31+6= -25

if the two given have like signs, just add and copy the sign, example, 3+4=7, -5+(-29)= -34
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