Example 1 - Chapter 3 Class 7 - Finding Common Ground (Ganita Prakash II)

Last updated at August 14, 2026 by

[Class 7 Maths] Find the common factors, and the HCF of 45 and 75. - Finding HCF using Prime Factorisation

part 2 - Example 1 - Finding HCF using Prime Factorisation - Chapter 3 Class 7 - Finding Common Ground (Ganita Prakash II) - Class 7 (Ganita Prakash 1, 2 & old NCERT)

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Transcript

Example 1 Find the common factors, and the HCF of 45 and 75.Let’s find Prime Factorisation of both 45 & 75 Now, 45 = 3 × 3 × 5 75 = 3 × 5 × 5 HCF of 45, 75 = 3 × 5 = 15Now, we need to find Common Factors also Common Factors of 45 & 75 Since 45 = 3 × 3 × 5 75 = 3 × 5 × 5 The common factors are 3 5 And, 3 × 5 = 15 Thus, common factors are 3, 5 and 15

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