Question

Find the HCF of 72,126, and 90 using prime factorisations method​

Answer 1

Answer:

18

Step-by-step explanation:

72=2×2×2×3×3 = 2³×3²

126=2×3×3×7 = 2×3²×7

90=2×3×3×5 = 2×3²×5

Hence, HCF of 72, 126, 90 = 2×3² = 2×9 = 18