32 485 + 260 + 515 + 740 = 34 000
= ( 32 485 + 515 ) + ( 260 + 740 ) =
= 33 000 + 1 000 =
= 34 000
_____________________________
56 243 + 57 + 35 + 965 = 57 300
= ( 56 243 + 57 ) + ( 35 + 965 ) =
= 56 300 + 1 000 =
= 57 300
________________________________
3 587 + 725 + 275 + 413 = 5 000
= ( 3 587 + 413 ) + ( 725 + 275 ) =
= 4 000 + 1 000 =
= 5 000
