28=2²·7 48=2⁴·3 ---------------- GCF=2²=4 Answer:4

GCF of 28 and 48 is 4 The factors of 28 are: 1, 2, 4, 7, 14, 28 The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48