How do you write 1978 in roman numerals

M=1000
C=100
L=50
X=10
V=5
I=1

M. . . . . .CM. . . . . . . LXX. . . . . . . VIII

1000. . .1000-100 . . 50+10+10. . 5+1+1+1

1000. . . 900 . . . . . . 70. . . . . . . . .8

1978

1978= MCMLXXVIII

MCMLXXVIII

1978 = MCMLXXVIII

M=1000
C=100
L=50
X=10
V=5
I=1
Combine all
MCLXVI