What does mcmlxv mean in roman numerals?

Answer 1

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