## anonymous one year ago Out of these numbers list the ones that are Natural Numbers: -8, -2/5, 0, 0.4, -8, 0, @RT{5},

1. anonymous

$-8, \ - \frac { 2 }{ 5 }, 0, 0.4, \sqrt{5}, \sqrt{49}$

2. anonymous

Look at the equation, not the question I typed out

3. anonymous

@ganeshie8 @geerky42

4. anonymous

Natural numbers are the counting numbers. Pretend you are counting on your fingers. Which of these numbers are counting numbers?

5. anonymous

So would this be my answer: $-8, 0, 0.4, \sqrt{5}, \sqrt{49}$ in that correct order?

6. anonymous

@ospreytriple

7. anonymous

You can't count -8 on your fingers, or 0.4, etc. Imagine you've got a basket of apples and you're counting them. Those numbers are the natural numbers. {1, 2, 3, ...}

8. anonymous

So my natural numbers would be this answer then perhaps right? $0, \sqrt{5}, \sqrt{49}$

9. anonymous

Unfortunately, there is no agreement as to whether zero is a natural number, but my experience has been that it is normally included as well.

10. anonymous

Can you hold up $$\sqrt{5}$$ fingers?

11. anonymous

Oh so those are imaginary numbers right?

12. anonymous

No. Imaginary numbers are something else. $$\sqrt{5}$$ is what's called an irrational number. So what's your final answer?

13. anonymous

So my only real natural number could be $0$. Because it cant be a fracton either correct?

14. anonymous

Well. Do you what $$\sqrt{49}$$ equals?

15. anonymous

7?

16. anonymous

Right. So is that a natural number?

17. anonymous

Yes it is. So my natural numbers are: $0, \sqrt{49}$?

18. anonymous

Correct. Well done. The set of natural numbers doesn't have any fractions, or decimals, or negative number. Just counting numbers.

19. anonymous

Thank you!

20. anonymous

You're welcome