Common Factors

Chapter 3 Class 6 Playing with Numbers
Concept wise

## Write common factors of 4 & 18

We find factors of 4 & 18 separately

So, Common factors of 4 & 18 are 1, 2

## Write common  factors of 4 & 15

We find factors of 4 & 15 separately

So, Common factors of 4 & 15 are 1

Note:

If two numbers have common factor 1

Then, they are co-prime numbers

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### Transcript

Factors of 4 1 × 4 = 4 2 × 2 = 4 4 × 1 = 4 We stop here as 1 & 4 have occurred earlier So factors of 4 are 1, 2, 4 Factors of 18 1 × 18 = 18 2 × 9 = 18 3 × 6 = 18 6 × 3 = 18 We stop here as 6 & 3 have occurred earlier So factors of 18 are 1, 2, 3, 6, 9, 18 Factors of 4 1 × 4 = 4 2 × 2 = 4 4 × 1 = 4 We stop here as 1 & 4 have occurred earlier So factors of 4 are 1, 2, 4 Factors of 15 1 × 15 = 15 3 × 5 = 15 5 × 3 = 15 We stop here as 3 & 5 have occurred earlier So factors of 15 are 1, 3, 5, 15

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.