fpb dari 64 dan 80 pakai fohon faktor dengan gambar

64. 80. 80:2×2×2×2×5
/\ /\ 64:2×2×2×2×4
2. 32. 2. 40. fpb:2×2×2×2:16
/\ /\
2. 16. 2 20. maaf kalu salah
/\ /\
2. 8 2. 10
/\ /\
2 4 2. 5
/\
2 2