Question

find LCM and HCF of 45 and 90 by prime factorisation​

Answer 1

Answer:

hey friend here your answer hope it helps

Answer 2

Answer:

The prime factorization of 90 is: 2 x 3 x 3 x 5. The prime factors and multiplicities 45 and 90 have in common are: 3 x 3 x 5. 3 x 3 x 5 is the gcf of 45 and 90. gcf(45,90) = 45.

What is the LCM of 45 and 90?

The lcm of 45 and 90 is 90.

Steps to find LCM

• Find the prime factorization of 45
• 45 = 3 × 3 × 5
• Find the prime factorization of 90
• 90 = 2 × 3 × 3 × 5
• Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:

• LCM = 2 × 3 × 3 × 5
• LCM = 90