add or subtract the following directed number
(-105)+ ( -117)
(-168)+(-35)
(+310)+(+130)
(+217)-(-128)
(-246)-(+14)
(-129)-(-116)
(+63)+(-127)+(-18)
(-21)+(+14)+(-42

Solution:
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Using: 
(+a) + (+b) = a + b,
(-a) + (+b) = - a + b,
(+a) + (-b) = a - b
(-a) + (-b) = - a - b
 
  • (-168)+(-35) = -168 - 35 = -203
  • (+310)+(+130) = 310 + 130 = 440
  • (+217)-(-128) = 217 + 128 = 345
  • (-246)-(+14) = - 246 - 14 = -260
  • (-129)-(-116) = - 129 + 116 = -13
  • (+63)+(-127)+(-18) = 63 - 127 - 18 = - 82
  • (-21)+(+14)+(-42) = -21 + 14 - 42 = -7 - 42 = - 49
     

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