Ex 3.4, 1 - Find common factors of (a) 20 and 28 (b) 15 25 (c) 35 50

This video is only available for Teachoo black users

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


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

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.