Question

Neha said she had a different way of working out LCMs. Here is Neha's method for finding the LCM of 90 and 300:
Step 1: Find the HCF first using the product of primes
90 = 2 X 3 X 3 X 5
300 = 2 X 2 X 3 X 5 X 5
Common factors are one each of 2, 3 and 5. So HCF = 2 X 3 X 5 = 30
Step 2: LCM = HCF X numbers left over
LCM = 30 X 2 X 3 X 5 = 900
a)Check Neha's method by using it to work out the answers to Question 2 again.
b)Rani said Neha's method wouldn't work if you had to find the LCM of three
numbers. Is she right? Try using Neha's
method for Question 3.
с)Are there any occasions when Neha's
method will work with three numbers?​

Answer 1

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