Natural numbers worksheet - Free Printable

Problem Analysis:

The task is to determine whether each number in the image is a natural number or not. If the number is a natural number, we write "N"; otherwise, we write "X".

#### Definitions:
- Natural Numbers: These are positive integers starting from 1 (i.e., 1, 2, 3, ...). Natural numbers do not include zero, negative numbers, fractions, or decimals.

#### Steps:
1. Identify each number in the image.
2. Check if the number is a natural number:
- It must be a positive integer.
- It cannot be negative, a fraction, a decimal, or zero.
3. Write "N" if it is a natural number, and "X" if it is not.

Numbers in the Image:

The numbers are:
- 85
- 8.9
- -45
- 24
- 4/5
- 56
- 8/2
- 88
- 7.9
- 9.5
- -67
- 43
- 5/3

Solution:

Let's analyze each number:

1. 85: This is a positive integer.
→ N

2. 8.9: This is a decimal number.
→ X

3. -45: This is a negative integer.
→ X

4. 24: This is a positive integer.
→ N

5. 4/5: This is a fraction (not an integer).
→ X

6. 56: This is a positive integer.
→ N

7. 8/2: This simplifies to 4, which is a positive integer.
→ N

8. 88: This is a positive integer.
→ N

9. 7.9: This is a decimal number.
→ X

10. 9.5: This is a decimal number.
→ X

11. -67: This is a negative integer.
→ X

12. 43: This is a positive integer.
→ N

13. 5/3: This is a fraction (not an integer).
→ X

Final Answer:

\[
\begin{aligned}
&85: \text{N} & 8.9: \text{X} & -45: \text{X} \\
&24: \text{N} & 4/5: \text{X} & 56: \text{N} \\
&8/2: \text{N} & 88: \text{N} & 7.9: \text{X} \\
&9.5: \text{X} & -67: \text{X} & 43: \text{N} \\
&5/3: \text{X}
\end{aligned}
\]

\boxed{N, X, X, N, X, N, N, N, X, X, X, N, X}