1965
I=1
V=5
X=10
L=50
C=100
M=1000
The way it works is that if a lower numeral is before a higher numeral (like IX where I is before X) you subtract (X-I=10-1=9).
If the lower number is after the higher number (like XI where I is after X) you add (X+I=10+1=11).
So here we have MCMLXV=M+CM+L+X+V (CM=M-C=1000-100=900)
=1000+900+50+10+5=1965
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In today's terms: VIII-III-MCMLXV
1965. Mcm - 1000+(1000-100) lxv = 50+10+5
In today's terms: I-IV-MCMLXV
Under today's rules now governing the Roman numeral system the Roman numeral of MCMLXV is equivalent to 1965 as an Hindu-Arabic numeral
march 15 in roman numbers is III XV MCMLXV