Answers

2016-06-19T02:11:10+08:00
Addition and subtraction: (same sign) add the numbers and keep the sign.
ex. (-1)+(-4)= -5 and 1+4=5
           : (diff. signs) subtract the numbers and keep the sign of the highest number. ex.1 -8+2=-6 and -2+8=6

multiplying and diving: (same sign) if the numbers has same sign the result are always POSITIVE. ex. -2*-4=8 and 2*4=8 ; -3/-6=2 and 3/6=2
             :(diff. sign) if the numbers has different signs the result is ALWAYS NEGATIVE. ex. 4*-5=-20 and 8*-2=-16, ;  -3/6= -2 and 3/-6=-2
 


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