In primary schools, the conversion of all units, such as weight unit 1000 g = 1 kg, length unit 1 m = 100 cm, must be complete fast

RMB unit: 1 yuan = 10 Jiao, 1 jiao = 10 min, 1 yuan = 100 min time unit: first grade = 12 months, 1 day = 24 hours, 1 hour = 60 min, 1 min = 60 seconds length unit: 1 km = 1000 m, 1 m = 10 decim, 1 decim = 10 cm, 1 cm = 10 mm area unit: 1 square km = 100 ha, 1 ha = 10000 M2 1