Question

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

Answer 1

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

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

`(9)/(20)* 100\\\\=9* 5\\\\=45\%`

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

Answer 2

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%