Prime and Composite Numbers

Q. What is the sum of the first 5 prime numbers?

1. 17
2. 25
3. 28
4. 39

Q.

Express $36$ as the sum of twin prime.

Q.

Write all the twin prime numbers from $51$ to $100$.

Q.

Write all composite numbers between $110$ to $120$ ?

Q.

Write all odd composite numbers less than $50$.

Q.

How many prime numbers are less than $20$?

Q. Which is the smallest number exactly divisible by the first five prime numbers

Q.

The greatest $2$-digit prime number is ______.

Q.

Find a two-digit prime number such that the number obtained by reversing by their digits are also prime.

Q. How 54 can be written as a product of its prime factors?

1. $1\times 2\times 3\times 3$
2. $2\times 2\times 3\times 3$
3. $2\times 3\times 2\times 2$
4. $2\times 3\times 3\times 3$

Q.

Factorise natural numbers from 11 to 20 to discover which numbers are prime and which are composite .

Q.

Write all the prime numbers between

$10\mathrm{and}15$

Q.

Find the prime numbers from the given options.
This question can have more than one correct answer.

1. 13

2. 9

3. 1

4. 11

Q.

Fill in the blanks:

The smallest prime number and only even prime number is ____.

Q. is the only even prime number.

Q.

The smallest prime number is_____________

Q.

How many two-digit prime number can be formed in which boththe digit are prime number

Q.

The numbers $13$ and $31$ are prime numbers. Both these numbers have same digits $1$ and $3$. Find such pairs of prime numbers upto $100$.

Q. Which of the following will not give a composite number?

1. 1 × 12
2. 2 × 7
3. 19 × 1
4. 13 × 3

Q. Which of these is a prime factor of 75?

1. 15
2. 2
3. 25
4. 3

Q.

Find the possible missing numbers so that the following pairs become twin primes:

$\_\_\_,31$

Q.

All even numbers are composite numbers .

1. True
2. False

Q.

Write each of the following numbers as the sum of twin primes:

(ii) $24$

Q.

The sum of two even natural numbers is an even number.

1. True
2. False

Q.

Find the sum of composite numbers between $8$ and $12$.

Q. Find the composite number.

1. 47
2. 43
3. 45
4. 41

Q.

Find the possible missing numbers so that the following pairs become twin primes

$101,\_\_\_$

Q.

Express $24$ as a sum of twin primes.

Q. 1 is a factor of ___ natural number.

1. composite
2. even
3. every
4. odd

Q.

Write all composite numbers between $90$ to $95$ ?