Răspuns:
Explicație pas cu pas:
5300 cm = 530 dm = 53 m => 5300 cm = 5,3 = fals
2,5 t = 2500 kg = corect
4700 cm = 470 dm = 47 m = corect
65000 ml = 65000 : 1000 = 65 l = corect
27000 ml = 27000 : 1000 = 27 l = corect
5 ha = 5 x 10000 m² = 50000 m² =>5 ha = 5000 m² = fals
3,2 t = 3200 kg = corect
3 ha = 3 x 10000 m² = 30000 m²=> 3 ha = 3000 m² = fals
1h 7' 38'' = 3600''+420'' = 4020''
1' = 60'' => 7' = 7x60'' = 420''
1h = 60' = 60x60'' = 3600''
1h 8' 37'' = 3600''+480'' = 4480''
8' = 8x 60'' = 480''
1h = 3600''