a) -37 + 54 + (-70) + (-163) + 256
= [- 37 + (-163)] + [54 + 256] + (-70)
= -200 + 300 - 70
= 100 - 70
= 30
b) – 359 + 181 + (-123) + 350 + (-172)
= -178 - 123 + 350 - 172
= -178 - 172 - 123 + 350
= -350 - 123 + 350
= -350 + 350 -123
= 0 - 123
= -123
c) −69 + 53 + 46 + (−94) + (−14) + 78
=−69 + 53 + 46 + (−94) + (−14) + 78
=(78 − 94 + 46) + (53 − 69 − 14)
=30 + (−30)
= 0
d) -2003 + (-21+75 + 2003)
= -2003 -21 + 75 + 2003
= -2003 + 2003 -21 + 75
= 0 -21 + 75
= -21 + 75
= 54
e) 1125 – ( 374 + 1125) + (-65 +374)
= 1125 – 374 - 1125 - 65 + 374
= (1125 - 1125) - (374 + 374) - 65
= 0 - 0 - 65
= -65
f) 31. (-18) + 31. ( - 81) – 31
= 31 . ( - 18 - 81 - 1)
= 31 . (-100)
= -3100