18=2×3×3 (2×3=6, 6×3=18)
27=3×3×3 (3×3=9, 9×3=27)
45=3×3×5 (3×3=9, 9×5=45)
GCF is 3×3=9
Step-by-step explanation:
Prime factorization of 27 and 45 is (3 × 3 × 3) and (3 × 3 × 5) respectively. As visible, 27 and 45 have common prime factors. Hence, the GCF of 27 and 45 is 3 × 3 = 9.
