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1mg=0,001g
1g=0,1dag
1) 44mg = 44 * 0,0001dag = 0,0044dag
2,5cm3 = 2,5 * 10mm *10mm *10mm = 2500mm3
2) d=m/V = 840kg/0,2m3=4200kg/m3
4200kg/m3 = 4200 *1000g / 100cm*100cm*100cm= 4,2g/cm3
3) a=0,02....(m) (brak jednostki) jeśli m to = 2 cm
V=a3 = (2 cm)3 = 8cm3
d=m/V= 18g/8cm3=2,25g/cm3