Prime Numbers

पहली पांच अभाज्य संख्याओं का योग है ?

The sum of three number is $98$. If the ratio of the first to the second is $2:3$ and that of the second to the third is $5:8$, then the second number is:

$420$ is prime or composite number.

What is the least prime number.

Which of the pairs is neither co prime nor twin prime.

Are the following pair of numbers co-prime numbers.

$83$and $120$

Find the value of $2+2\times 56+73\times 467=?$

What are the two consecutive numbers from 10 to 25 which are semi prime numbers .

What are co-primes.

One fourth of the sum of the prime numbers, greater than $4$ but less than $16$, is the square of

$2,3,5,7,11,13,17,19,\dots \dots \dots$ are

The least prime number is

Which of the following numbers is prime

A prime number nearest to $68$ is

How many prime numbers are there in

the following numbers $3,18,28,37,54,67,79,91,113,171,253,346$

The number which is neither prime nor composite is

The numbers which are not only divisible by themselves and $1$ are known as

Swap with a partner and complete their brainteaser. Discuss and check your answer together.

In a leap year, find out how many months have a prime number of days.

Write your own brainteaser with clues using your knowledge of factors, composite and prime numbers, for a partner to solve.

Swap with a partner and complete their brainteaser.

In a leap year, find out how many months have a prime number of days.

Write your own brainteaser with clues using your knowledge of factors, composite and prime numbers, for a partner to solve.

Write the answer to your brainteaser on a separate piece of paper.

Express $2018$ as the sum of two prime numbers.