The Etruscans came up with the numerals by making a V with there hand[five].10 was made by making 2 V's with there hands and putting them together.
16
LV
D
V
That is 29.
MCXVII
10 = X in Roman numerals
3409 in Roman numerals is MMMCDIX
DCCCXXXII in roman numeral is 832.
LXX
20
VI = 6