What do iv mean an numbers?

Answer 1

I'm assuming that you are referring to IV which is roman numerals for 4 (1 before 5 WHICH IS V)

I = 1

V = 5

X = 10

count up in 1s until it uses less digits to count back from the next 'big' number

I = 1

II = 2

III = 3

IV = 4 if the I is before the V it means count back

V = 5

VI = 6

VII = 7

VIII = 8

IX = 9

X = 10

:) hope it hlps... p.s. you could use Google it has a converter biult in :)