48和64的公因数是1,2,4,8和16。
48=1×48=2×24=3×16=4×12=6×8,48的因子是1,2,3,4,6,8,12,16,24,48;
6 = 1× 64 = 2× 32 = 4× 16 = 8× 8,64的因子是1,2,4,8,16,32,64;
所以48和64的公因数是1,2,4,8,16,一共五个。