Explicație pas cu pas:
a)180 dam + 320 dam= 400 dam=40 m
400 dam= 40 m
1000 m =100 dam
100 dam – 50 dam= 50 dam
6×250 dam= 1500 dam=150 hm
b) 4 m = 40 dm
40 dm + 32 dm = 52 dm
30 dm = 3 m
42 m – 3 m = 39 m
6 × 220 dm = 1320 dm = 132 m
c) 17 dm = 170 cm
170 cm + 19 cm = 189 cm
70 cm = 7 dm
415 dm – 7 dm = 408 dm
80 mm : 2 = 40 mm = 4 cm