Last updated at Jan. 3, 2019 by Teachoo

Transcript

Ex 3.5, 11 18 is divisible by both 2 and 3. It is also divisible by 2 × 3 = 6. Similarly, a number is divisible by both 4 and 6. Can we say that the number must also be divisible by 4 × 6 = 24? If not, give an example to justify your answer.Numbers divisible by 4 are 4, 8, 12, 16, 20, 24, 28, 32, 36,…… Numbers divisible by 6 are 6, 12, 18, 24, 30, 36,…….. Numbers divisible by 4 & 6 are 12, 24, 36,……….. We see that 12, 36, .. are not divisible by 24 So, a number divisible by 4 and 6 is not divisible by 24 Note: This is because 4 & 6 are not co-prime

Chapter 3 Class 6 Playing with Numbers

Concept wise

- Factors and Multiples
- Perfect number
- Prime and Composite Numbers
- Sum of prime numbers
- Prime numbers from 1 to 100
- Divisibility Tests - Divisibility by 5, 10, 2
- Divisibility Tests - Divisibility by 4, 8
- Divisibility Tests - Divisibility by 3, 6, 9
- Divisibility Tests - Divisibility by 11
- Divisibility Tests - All
- Common Multiples
- Common Factors
- More Divisibility Rules
- Factor Tree
- Prime Factorisation
- Highest Common Factor
- Lowest Common Multiple
- Statement questions on LCM
- Statement questions on HCF

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.