1) 1g= 0,001kg= 10^{-3} kg
1cm^3 = 0,000 001 m^3 = 10^{-6} m^3
1,4* 10^{-3}/10^{-9}= 1,4*10^3 kg/m^3 = 1400kg/m^3
Potenzgesetz: a^{-b}/c^{-d} = a^{-b+d}
2) 5l → m³
1L = 1dm^3 = 0,001m^3
5L = 0,005 m^3
3) 50 km/h → m/s
1km/h = 1000m/3600s = 10/36 = 5/18 m/s = 0,2778 m/s
50km/h = 5/18*50 = 250/18 = 125/9 = 13 8/9 m/s = 13,89 km/h
4) 30° → radiant (Bogenmaß b)
Es gilt:
φ/180° = b/pi
30°/180°= b/pi
1/6 = b/pi
b= pi/6