You are here
![What are the common factors? Worksheet, Examples - [with Video] - Common Factors](https://cdn.teachoo.com/6468378f-dc94-4010-8ead-16b50edf81da/slide20.jpg)
Common Factors
Last updated at July 8, 2025 by Teachoo
Class 6 (Ganita Prakash & Old NCERT)
Chapter 5 Class 6 - Prime Time (Ganita Prakash)
- Factors and Multiples
- Common Multiples
-
Common Factors
- Idli Vada Game
- Jumpy Jackpot
- Figure it out - Page 110, 111
- Prime Numbers
- Figure it out - Page 114, 115
- Co-prime numbers (and art)
- Prime Factorisation
- Uses of Prime Factorisation
- Divisibility Tests
- Figure it out - Page 125, 126
- Fun with numbers
- Teachoo Questions - MCQs
- Teachoo Questions - Mix
- Teachoo Questions - Assertion Reasoning
- Teachoo Questions - Case Based
Transcript
Common Factors Write common factors of 4 & 18 We find factors of 4 & 18 separately Factors of 4 Factors of 18 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 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 So, Common factors of 4 & 18 are 1, 2 Write common factors of 4 & 15 We find factors of 4 & 15 separately Factors of 4 Factors of 15 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 1 × 15 = 15 3 × 5 = 15 5 × 3 = 15 We stop here as 3 & 5 have occurred earlier So, Common factors of 4 & 15 are 1 So factors of 15 are 1, 3, 5, 15 Note: If two numbers have ONLY common factor 1 Then, they are co-prime numbers Example: 2 and 3 5 and 9 20 and 7
