Question

What is the sum of all prime numbers from 60 to 80?

Answer 1

Sum of prime no. = 61+67+71+79 = 278.

Answer 2

The sum of all prime numbers from 60 to 80 is 351

Given : The number range is, 60 to 80

To find : The sum of all prime numbers of the given number range.

Solution :

We can simply solve this mathematical problem by using the following mathematical process.

To solve this mathematical problem, we have to know more about prime numbers.

Prime numbers :

• "The numbers (greater than 1) which are only divisible by 1 and itself, are known as prime numbers."
• Eg. 3,7,13 are prime numbers.

Now, we have to identify the prime numbers in the given number range.

Prime numbers in the given number range = 61,67,71,73,79

(These numbers are only divisible by 1 and by themselves, that's why they are considered to be prime numbers.)

Their sum = 61+67+71+73+79 = 351

(This will be considered as the final result.)

Hence, the sum of all prime numbers from 60 to 80 is 351