Răspuns:
1. 230 × 100 + 160.000 : 1000 = 23.000 + 160 = 23.160
72.072 - 720 × 100 : 1000 = 72.072 - 72.000 : 1000 =
72.072 - 72 = 72.000
2. 90.989 - b = 989
b = 90.989 - 989
b = 90.000
90.989 - 90.000 = 989
4.400 + c = 444.480
c = 444.480 - 4.400
c = 440.080