Numberblocks pre-M HD

1 I 2 II 3 III 4 IV 5 V 6 VI 7 VII 8 VIII 9 IX 10 X 11 XI 12 XII 13 XIII 14 XIV 15 XV 16 XVI 17 XVII 18 XVIII 19 XIX 20 XX 21 XXI 22 XXII 23 XXIII 24 XXIV 30 XXX 40 XL 50 L 60 LX 70 LXX 80 LXXX 90 XC 100 C 101 CI 102 CII 200 CC 300 CCC 400 CD 500 D 600 DC 700 DCC 800 DCCC 900 CM 1,000 M