IV: 4
X: 10
IX: 9
II: 2
III: 3
IV 4
VIII: 8
X: 10
VI: 6
规律: I (1), V (5), X (10), L (50), C (100)等
左大右小或相等则相加: II (1 + 1 = 2), III (1 + 1 + 1 = 3), VI (5 + 1 = 6), VII (5 + 1 + 1 = 7), VIII (5 + 1 + 1 + 1 = 8), XV (10 + 5 = 15)
左小右大则相减: IV (5 - 1 = 4), IX (10 - 1 = 9)
4 10 9 2 3 4 8 10 6
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