Ex 1.1, 3 (i) - Chapter 1 Class 10 Real Numbers (Important Question)

Last updated at July 26, 2026 by

Ex 1.1, 3 (i) - Find LCM and HCF of 12, 15 and 21 [with Video] - Ex 1.1

part 2 - Ex 1.1, 3 (i) - Ex 1.1 - Serial order wise - Chapter 1 Class 10 Real Numbers

 

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Ex 1.1, 3 Find the LCM and HCF of the following integers by applying the prime factorisation method. 12, 15 and 21 Finding HCF 12 = 2 × 2 × 3 15 = 3 × 5 21 = 3 × 7 ∴ H.C.F = 3 L.C.M = 2 × 2 × 3 × 5 × 7 = 420

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