1. Why do we need natural numbers?

Because we need to count things.

2. Why do we need whole numbers?

We need number where we can show that someone owes something.

3. Why do we need fractions?

Because we need a number to show how many parts od whole thing is taken/eaten.

4. Why so we irrational numbers?

So we can calculate area of round things.

5. Why do we need real numbers?

See 3rd and 4th answer.

6. Why do we need lateral (imaginary) numbers?

Because we need it for our alternate current calculations.

If you like video idea than watch all the parts

https://youtube.com/watch?v=T647CGsuOVU

He is probably in Country where you can go to two ATMs who are near each other. Takes money from one ATM than goes to other ATM. Second ATM shows original sum (like money never left first ATM).

ATMs are connected to Internet but in some countries sync with main database is slower (every 10/20 minutes).

I read that one giant supermarket in China has bigger electricity bill for cooling the building during winter than during summer because more people go to supermarket in winter. Humans are walking ovens.