- Matemáticas:
2. Calcula
9 hm 5m + 2km 3 m
7 dam 6m + 5 m 6dm
4 hm 1 dam 6 m + 8 dam 5 m 8 dm
5 km 9 hm 2 dam - 7 hm 6 m
2 m 6 mm - 8 cm 3 mm
1 dam 8 m - 1 m 4 dm
