(-37) +54 + 70-163 +246
=[(-37)-163)]+(54+246)+70
=(-200)+300+70
=100+70
=170
(-359) +181 +(-123) +350+(-172)
=[(-359)+350]+[181+(-172)]+(-123)
= (-9)+9+(-123)
= 0 + (-123)
= -123
(-69) +53 +46+(-94)+(-14) +78
= (-69) + [53 +46+(-94)+(-14)]+78
= (-69)+(-9)+78
= (-78)+78
= 0
(17-229) +(17-25+229)
=17-229+17-25+229
=(17+17)+(-229+229)-25
=34+0-25
=9
(125-679) +145-(125-679)
=125-679 +145-125+679
= (125-125)+(-679+679)+145
=0+0+145
=145
-(269-357) + (269– 357)
=-269+357+269-357
=(-269+269)+(357-357)
=0+0
=0
