jika a=243 dan b=125 maka nilai a 1per5 - b 1per3 adalah

a 1/5 - b ⅓
= 243 1/5 - 125 ⅓
= 243 3/15 - 125 5/15
= 242 18/15 - 125 5/15
= 117 13/15

Atau
a 1/5 - b ⅓
= (5a + 1)/5 - (3b + 1)/3
= ( 5(243) + 1 )/5 - ( 3(125) + 1 )/3
= (1215 + 1)/5 - (375 + 1)/3
= 1216/5 - 376/3
= 3648/15 - 1880/15
= 1768/15
= 117 13/15