Zamiana jednostek:
1km= 1000m, a 1m= 0,001km
1cm= 10dm, a 1dm= 0,1m
1m= 100cm, a 1cm=0, 01
1m= 1000mm, a 1mm= 0, 001
1s= 1/60 min,a 1min= 60s
1s=1/3600, a 1h= 3600s
1min= 1/60h, a 1h= 60min
1kg= 1000g, a 1g= 1/1000kg
1kg=100dag, a 1dag= 1/100dag
1t=1000kg,a 1kg=1/100t
1dag= 10g, a 1g= 1/10 dag