Question

Find the HCF of the following by the method of prime factorisation.
a. 42and 63
b. 25 and 90​
c. 18,24,32

Answer 1

Answer:a.21 b.5 c.2

Step-by-step explanation:

a.42= 2×3×7×1

63= 3×3×7×1

Common factors= 3×7×1= 21

b. 25= 5×5×1

90= 2×5×3×3×1

Common factors= 5×1= 5

c. 18= 3×3×2×1

24= 3×2×2×2×1

32= 2×2×2×2×2×1

Common factors= 2×1= 2