a) 86 + 357 + 14 = (86 + 14) + 357
= 100 + 357
= 457
b) 25 . 13 . 4 = (25 . 4) . 13
= 100 . 13
= 1300
c) 28 . 64 + 28 . 36 = 28 . (64 + 36)
= 28 . 100
=2800
a) 86 + 357 + 14
= ( 86 + 14 ) + 357
= 100 + 537
= 637
b)25 . 13 . 4
= ( 25 . 4 ) . 13
= 100 . 13
= 1300
c) 28 . ( 64 + 36 )
= 28 . 100
= 2800
a (86+14)+357=100+357=457
b 25.13.4=(25.4).13=100.13=1300
c 28.64+28.36=28.(64+36)=28.100=2800
a) 86 + 357 + 14 = (86 + 14) + 357
= 100 + 357
= 457
b) 25 . 13 . 4 = (25 . 4) . 13
= 100 . 13
= 1300
c) 28 . 64 + 28 . 36 = 28 . (64 + 36)
= 28 . 100
=2800