CXX – XLVI = 120 – 46 = 74 = LXXIV
Liczby w systemie rzymskim:
I – 1, II – 2, III – 3, IV – 4, V – 5, VI – 6, VII – 7, VIII – 8, IX – 9, X – 10,
XX – 20, XXX – 30, XL – 40, L – 50, LX – 60, LXX – 70, LXXX – 80, XC – 90, C – 100,
CC – 200, CCC – 300, CD – 400, D – 500, DC – 600, DCC – 700, DCCC – 800, CM – 900, M – 1000