xxviii
xxviii is the Roman numeral form for 28, or twenty-eight. It can describe something with that value, and it can also name the cardinal number itself: the sum of twenty-seven and one. But when is xxviii more natural than simply writing 28 or twenty-eight? This lesson looks at its Roman numeral structure, how X, V, and I add up, and why you’re more likely to see it in chapter numbering, prefaces, clock faces, or event names than in everyday writing. Watch the full lesson to learn how to read and use xxviii with confidence.