Question

What percent of the first 20 natural numbers are one-digit numbers?

Answer 1

It depends on how you define natural numbers. There are two possible definitions.

1. All non-negative integers.
   one-digit natural numbers: 0 - 9 for a total of 10
   first 20 natural numbers: 0  - 19 for a total of 20
   10/20 = 50%

2. All positive integers.
   one-digit natural numbers: 1 - 9 for a total of 9
   first 20 natural numbers: 1 - 20 for a total of 20
   9/20 = 45%

Answer 2

Answer: There are 45% of first 20 natural numbers are one digit numbers.

Step-by-step explanation:

Since we have given that

In first 20 natural numbers, there are 9 one digit numbers as follows :

1,2,3,4,5,6,7,8,9.

So, Total  numbers = 20

One digit numbers = 9

So, Percentage of one digit number out of first 20 natural numbers would be

$\dfrac{9}{20}\times 100\\\\=9\times 5\\\\=45\%$

Hence, there are 45% of first 20 natural numbers are one digit numbers.