aseres hadibros - Why are there 40 commandments in 10 commandments?

When do one commandments stop and the next one start? Who's counting? Who got the number 10?

1. I am Hashem


2. your God


3. You shalt have no other gods before me


4. You shalt not make any graven image (So no 3D printing?)


5. You shall not bow down to them


6. or serve (them)



7. You shalt not take the name of the Lord thy God in vain


8. Remember the sabbath day


9. to keep it holy


10. Six days you shall labor


11. And do all your work


12. but the seventh day is a Sabbath to the LORD your God.


13. On it you shall not do any work, you


14. or your son


15. or your daughter


16. or your male servant



17. or your female servant,


18. or your ox


19. or your donkey


20. or any of your livestock,


21. or the sojourner (non jews?) who is within your gates,


22. that your male servant


23. and your female servant may rest as well as you.


24. You shall remember that you were a slave in the land of Egypt,


25. and the LORD your God brought you out from there


26. with a mighty hand



27. and an outstretched arm.


28. Honor thy father


29. and thy mother (2 commandments)


30. Thou shalt not kill (actually murder/certain types of killing presumably against other humans only. Many killing, is perfectly fine and encouraged. Just read http://biblehub.com/1_samuel/15-3.htm)


31. Thou shalt not commit adultery (Most disagree on what it really means)


32. Thou shalt not steal


33. Thou shalt not bear false witness against thy neighbor (literally comrades)


34. You shall not covet your neighbor's house


35. you shall not covet your neighbor's wife,


36. or his male servant,



37. or his female servant,


38. or his ox,


39. or his donkey,


40. or anything that is your neighbor's.

Some may think my division to 40 is excessive. Still if I shorten it, it'll still be way more than 10. Most denominations divide the commandments differently anyway, suggesting that the division is not clear cut.