a). 16985 +2146=19.131
prin rotunjire la mii : 16985+2000=18.985
b). 32538+4986=37.524
prin rotunjire la mii :
32538+5000=37.538
c). 75434+4005=79.439
prin rotunjire la mii :
75434+4000=79.434
d). 64523+3998=68.521
prin rotunjire la mii :
64523+4000=68.523
