luna o saptamana 1/4 - fractie subunitara
4 saptamani 4/4 - fractie echiunitara
saptamana 10 zile=10/7 supraunitara
3 zile=3/7 subunitara
deceniul 10ani 10/10 echiunitara
8 ani 8/10 subunitara
secolul 25/100 subunitara
3 decenii 3/10 subunitara (un secol are 10 decenii)