Скачать или смотреть LCM — 3 Methods: Listing, Prime Factorization, Common Division | Class 6 CBSE | CH-3 PART-15

In this Class 6 CBSE lesson we learn three simple methods to find the LCM (Least Common Multiple):

1. Listing Multiples (visual + good for small numbers)
2. Prime Factorization (systematic; best for larger numbers)
3. Common Division / Short Division (fast, systematic ladder method)

Timestamps
00:00 Intro — what is LCM?
00:40 Method 1 — Listing Multiples (easy demo)
02:40 Method 2 — Prime Factorization (step-by-step)
07:25 Method 3 — Common (Short) Division / Ladder

LCM(a,b) = smallest positive integer that is a multiple of both `a` and `b`.
Use Listing when numbers are small / you want visual intuition.
Use Prime factorization for systematic work and for many numbers.
Use Common-division (ladder) when you prefer a quick table method that scales well.

Popular Method.
METHOD 3 — Common Division / Short Division (Ladder) — (step-by-step)

1. Write the numbers in a row.
2. Choose a prime that divides at least one number (start with 2).
3. Divide each number that is divisible by that prime; write unchanged any number not divisible.
4. Record the prime in the left column. Repeat the process on the new row until all numbers become 1.
5. Multiply all the primes in the left column — product = LCM.

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