0.007dam^3 =0.007*10^3 =0.007*1000 =7m^3
1400dm^3 =1400 : 10^3 =1400 :1000 =1.4 m^3
km^3 hm^3 dam^3 m^3 dm^3 cm^3 mm^3
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*10^3 *10^3 *10^3 /10^3 /10^3 /10^3
ex:2m^3 =2 *10^3*2 =2*10^6 =2*1000000=2000000cm^3
3000 mm^3 =3000:10^3*3 =3000:10^9 =3000 :1000000000=0.000003 m^3