The smallest natural number with the digits 1, 2, 3, and 0 is 1023.

Explanation:

To find the smallest natural number using the given digits, we need to place them in ascending order.

Step 1: Arrange the digits in ascending order

The given digits are 1, 2, 3, and 0. To find the smallest number, we need to arrange them in ascending order.

Arranging the digits in ascending order, we get: 0, 1, 2, 3.

Step 2: Combine the digits to form a number

Once the digits are arranged in ascending order, we can combine them to form the smallest number.

Combining the digits 0, 1, 2, and 3, we get the number 1023.

Therefore, the smallest natural number using the digits 1, 2, 3, and 0 is 1023.

Summary:

- The smallest natural number using the digits 1, 2, 3, and 0 is 1023.
- To find the smallest number, we need to arrange the digits in ascending order.
- By arranging the digits 0, 1, 2, and 3 in ascending order, we get the number 1023.

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