Question

how to get LCM of biggest number quickly?

Answer 1

there is no shortcute.

you have to factorise only

Answer 2

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⬇️HERE IS YOUR ANSWER⬇️
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After you've calculated a least common multiple, always check to be sure your answer can be divided evenly by both numbers. Find the LCM of these sets of numbers. Multiply each factor the greatest number of times it occurs in any of the numbers. 9 has two 3s, and 21 has one 7, so we multiply 3 two times, and 7 once.


Let's find the LCM of 30 and 45. One way to find the least common multiple of two numbers is to first list the prime factors of each number.

30 = 2 × 3 × 5
45 = 3 × 3 × 5

Then multiply each factor the greatest number of times it occurs in either number. If the same factor occurs more than once in both numbers, you multiply the factor the greatest number of times it occurs.

2: one occurrence 
3: two occurrences 
5: one occurrence 
2 × 3 × 3 × 5 = 90 <— LCM

HOPE IT HELPS YOU ...!!
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