Question

1. Which number is neither a prime number nor a composite number?
2. Which of the following are pairs of co-primes?
(i) 8, 14 (ii) 4,5
(11) 17, 19 (iv) 27. 15
3. List the prime numbers from 25 to 100 and say how many they are
4. Write all the twin prime numbers from 51 to 100.
5. Write 5 pairs of twin prime numbers from 1 to 50.
6. Which are the even prime numbers?
in Prime Factors​

Answer 1

Answer:

1.1

2.(ii)

3.29,31,37,41,43,47,53,59,61,67,71,73,79,83,89 and 97.

4.(59, 61), (71, 73).

5.(3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43).

6.Two is the only even prime number because its only factors are 1 and itself. It is an even number as well because it can be divided by 2. All of the other prime numbers are odd, including 3, 5, 7, 11 and 13.

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Answer 2

Answer:

1. one is neither a prime number nor a composite number

2. 4,5 and 17,19

3. 29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97

in total they are 16 prime numbers

4. There is only two pairs of twin prime number between 51 to 100 : (59, 61), (71, 73)

5. (3, 5), (5, 7), (11, 13), (17, 19), (29, 31)

6. only 2

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