a)341.67+341.16+659.83
=341.(67+16)+659.83
=341.83+659.83
=83.(341+659)
=83.1000
=83000
b)42.53+47.156-47.114
=47.(156-114)+42.53
=47.42+42.53
=42.(47+53)
=42.100
=4200
c)-69+53+46+(-94)+(-14)+78
=-16+-48+64
=-64+64
=0
d)-37+54+(-70)+(-163)+246
=(-37-163)+(54+246)-70
=-200+300-70
=100-70
=30