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Finding LCM using Prime Factorisation
Last updated at January 23, 2026 by Teachoo
Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 3 Class 7 - Finding Common Ground (Ganita Prakash II)
- The Greatest of All
- Prime Factorisation
- Finding HCF using Prime Factorisation
- Figure it out - Page 54
- Least, but not Last!
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Finding LCM using Prime Factorisation
- Patterns, Properties, and a Pretty Procedure!
- Figure it out - Page 59
- Miscellenaous Questions on HCF, LCM
- Efficient Procedures for HCF and LCM
- Property Involving both the HCF and the LCM
- Figure it out - Page 63, 64
Transcript
Finding LCM using Prime FactorisationLCM means Least Common Multiple. It is the smallest number which is in the table of the given numbers. Find LCM of 4 & 6 LCM of 4 & 6 = 2 × 2 × 3 = 12 Find LCM of 12 & 16 LCM of 12 & 16 = 2 × 2 × 2 × 2 × 3 = 4 × 4 × 3 = 48Find LCM of 20, 28, 36 LCM of 20, 28, 36 = 2 × 2 × 3 × 3 × 5 × 7 = 4 × 9 × 35 = 1260 Find LCM of 13 & 23 LCM of 13 & 23 = 13 × 23 = 299
