Roman Numerals 罗马数字

The seven Roman numeral letters, the add and subtract rules, examples, and eight to try. Teacher copy has answers.

Roman numeralsRoman numerals 罗马数字Letters used as numbers: I, V, X, L, C, D, M.History Vocab ↗ use seven letters from the Latin alphabet. You still see them on clocks, in book chapters and at the end of movies.

Letter	I	V	X	L	C	D	M
Value	1	5	10	50	100	500	1000

Two rules

TipBigger to smaller: add

VI = 5 + 1 = 6 · XV = 10 + 5 = 15 · CLX = 100 + 50 + 10 = 160

TipA smaller letter before a bigger one: subtract

IV = 5 − 1 = 4 · IX = 10 − 1 = 9 · XL = 50 − 10 = 40 · XC = 100 − 10 = 90

Never use the same letter more than three times in a row: 4 is IV, not IIII.

Try it

Roman → number		Number → Roman
XII	______	8	______
XIX	______	24	______
LXV	______	49	______
MMXXVI	______	this year	______

NoteAnswer key

XII = 12 · XIX = 19 · LXV = 65 · MMXXVI = 2026 · 8 = VIII · 24 = XXIV · 49 = XLIX · 2026 = MMXXVI (2027 = MMXXVII)