a) -37+54+(-70) +(-163)+246
= ( -37 - 163 ) + ( 54 + 246 ) - 70
= -200 + 300 - 70
= 100 - 70
= 30
b) -359+181+(-123)+350+172
= ( -359 + 350 ) + ( 181 + 172 - 123 )
= -9 + 130
= 127
c) 13-12+11+10-9+8-7-6+5-4+3+2-1
= 1 + 11 + 1 + 1 -6 + 1 + 3 + 1
= 13
d) -69+53+46+(-94)+(-14)+78
= -69 + 53 + 46 - 94 - 14 + 78
= -16 + 46 - 94 - 14 + 78
= 30 -14 + ( 78 - 94 )
= 16 + ( -16 )
= 0