HCF and LCM questions prime factorization method which I was watching just now
Answers
Answer:
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Explanation:
- Numbers can be broken down into prime factors using prime factor trees. ...
Find the HCF and LCM of 24 and 180.
Cross any numbers used so far off from the products.
To find the LCM, multiply the HCF by all the numbers in the products that have not yet been used.
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Answer:
HCF is highest common factor and LCM is lowest common multiple.
Explanation:
For example, HCF of 9 and 18 is 9. This is because the factors of 9 are: 9, 3 and 1 and the factors of 18 are 18, 9, 2 and 1. This means that the highest factor in both numbers is 9. An example of LCM is that the LCM of 20 and 24 is 120. An easy method to work this out is to write the times tables down.
20 24
40 48
60 72
80 96
100 120
120 144
140 168
160 192
180 216
200 240
Write them up to times 10 ( 20 times 10 is 200 and 24 times 10 is 240 obviously) and then if you can see a number in both rows that is the lowest and the same which in this case is 120, then that is the LCM.
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