Ex 3.4

Chapter 3 Class 6 Playing with Numbers
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### Transcript

Ex 3.4, 1 Find the common factors of : (a) 20 and 28 We find factors of 20 and 28 separately So, Common factors are 1, 2, 4 Factors of 20 1 × 20 = 20 2 × 10 = 20 4 × 5 = 20 5 × 4 = 20 We stop here as 4 & 5 have occurred earlier So factors of 20 are 1, 2, 4, 5, 10, 20 Factors of 28 1 × 28 = 28 2 × 14 = 28 4 × 7 = 28 7 × 4 = 28 We stop here as 4 & 7 have occurred earlier So factors of 28 are 1, 2, 4, 7, 14, 28 Factors of 28 1 × 28 = 28 2 × 14 = 28 4 × 7 = 28 7 × 4 = 28 We stop here as 4 & 7 have occurred earlier So factors of 28 are 1, 2, 4, 7, 14, 28 Factors of 28 1 × 28 = 28 2 × 14 = 28 4 × 7 = 28 7 × 4 = 28 We stop here as 4 & 7 have occurred earlier So factors of 28 are 1, 2, 4, 7, 14, 28 Factors of 28 1 × 28 = 28 2 × 14 = 28 4 × 7 = 28 7 × 4 = 28 We stop here as 4 & 7 have occurred earlier So factors of 28 are 1, 2, 4, 7, 14, 28 