kpk dan fpb dari 45,72dan90 adalah

45
/\
3 15
..../\
...3 5

72
/\
2 36
...../\
...2 18
......./\
.....2 9
......../\
.......3 3

90
/\
2 45
....../\
...3 15
....../\
.....3 5

45 = 3² × 5
72 = 2³ × 3²
90 = 2 × 3² × 5
KPK = 2³ × 3² × 5 = 360
FPB = 3² = 9

fpb ny 9
kpk ny 360...