Question

4. Write down separately the prime and composite numbers less than 20.
5. What is the greatest prime number between 1 and 10?
6. Express the following as the sum of two odd primes.
(a) 44 (b) 36 (c) 24 (d) 18
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7. Give three pairs of prime numbers whose difference is 2.
[Remark: Two prime numbers whose difference is 2 are called twin primes].
8. Which of the following numbers are prime?
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(a) 23 (b) 51 (c) 37 (d) 26
9. Write seven consecutive composite numbers less than 100 so that there is no prime
number between them.​

Answer 1

Answer:

Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19

Composite numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18

7

there are 4 prime numbers between 1 and 10 but the greatest is 7 [prime numbers are those numbers which are only divisible from 1 and itself the prime numbers between 1 and 10 are 2,3,5 and 7] 2 is only even prime number. NOTE- 1 is a composite number. 7 is the greatest prime number between 1 to 10.

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