Question

what fraction of the natural numbers from 1 to 20 are prime numbers​

Answer 1

Answer:

Step-by-step explanation:

Numbers from 1 to 20

= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

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

Fraction= 8/19

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Answer 2

Given:

Natural numbers from 1 to 20

To find:

Fraction of natural numbers from 1 to 20 that are prime numbers

Solution:

We can find the solution by following the given process-

We know that to calculate the fraction, we need to find the number of prime numbers between 1 and 20.

The prime numbers are- 2, 3, 5, 7, 11, 13, 17, 19

Total prime numbers= 8

Total numbers from 1 to 20= 20

Fraction= Total prime numbers/ Total natural numbers

=8/20

=2/5

Therefore, the fraction of natural numbers from 1 to 20 that are prime numbers is 2/5.