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Last updated at June 13, 2018 by Teachoo

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Ex 3.2, 6 Express the following as the sum of two odd primes. (a) 4444 = 1 + 43 44 = 2 + 42 44 = 3 + 41 (We cant take this as 1 is neither prime nor composite) (We can’t take this as 2 is even) (Both 3 and 41 are prime and odd) Ex 3.2, 6 Express the following as the sum of two odd primes. (b) 36(We cant take this as 1 is neither prime nor composite) (We cant take this as 2 is even) (We can take this as 33 is not prime) (We can take this as 4 is not prime) Ex 3.2, 6 Express the following as the sum of two odd primes. (c) 24(We cant take this as 1 neither prime nor composite) (We cant take this as 2 is even) 24 = 1 + 23 24 = 2 + 22 24 = 3 + 21 24 = 4 + 20 24 = 5 + 19 (We can take this as 4 is even and composite) (Both 5 and 19 are odd and prime)

Sum of prime numbers

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.