![[Class 7] Find the common factors and the HCF of the numbers: 81, 243 - Finding HCF using Prime Factorisation](https://cdn.teachoo.com/0bc3e6fd-cd18-4256-8a53-f1bbdc551598/slide71.jpg)
Question (e) - Page 53 (Figure it out) - Finding HCF using Prime Factorisation - Chapter 3 Class 7 - Finding Common Ground (Ganita Prakash II)
Last updated at January 22, 2026 by Teachoo
Finding HCF using Prime Factorisation
Finding HCF using Prime Factorisation
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Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 3 Class 7 - Finding Common Ground (Ganita Prakash II)
- The Greatest of All
- Prime Factorisation
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Finding HCF using Prime Factorisation
- Figure it out - Page 54
- Least, but not Last!
- 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
Question (e) - Page 53 (Figure it out) Find the common factors and the HCF of the following numbers: (e) 81, 243Let’s find Prime Factorisation of both 81 & 243 Now, 81 = 3 × 3 × 3 × 3 243 = 3 × 3 × 3 × 3 × 3 HCF of 81, 243 = 3 × 3 × 3 × 3 = 81
