「ローマ数字」の版間の差分

| 12 || = || 10 × 1 || + || 1 × 2

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|   || = || {{Rn|XII}}

| 24 || = || 10 × 2 || + || (−1 + 5)

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|   || = || {{Rn|XXIV}}

|   || = || {{Rn|XL}} || + || {{Rn|II}}

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| 49 || = || (−10 + 50) || + || (−1 + 10) ||

|   || = || {{Rn|XL}} || + || {{Rn|IX}}

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| 89 || = || 50 || + || 10 × 3 || + || (−1 + 10)

|   || = || {{Rn|L}} || + || {{Rn|XXX}} || + || {{Rn|IX}}

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| 299 || = || 2 × 100 || + || (−10 + 100) || + || (−1 + 10)

|   || = || {{Rn|CC}} || + || {{Rn|XC}} || + || {{Rn|IX}}

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| 493 || = || (−100 + 500) || + || (−10 + 100) || + || 1 × 3

|   || = || {{Rn|CD}} || + || {{Rn|XC}} || + || {{Rn|III}}

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| 1960 || = || 1000 × 1 || + || (−100 + 1000) || + || 50 || + || 10

|   || = || {{Rn|M}} || + || {{Rn|CM}} || + || {{Rn|L}} || + || {{Rn|X}}

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|   || = || {{Rn|MM}} || + || {{Rn|X}} || + || {{Rn|V}} || + || {{Rn|III}}

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| 3999 || = || 1000 × 3 || + || (−100 + 1000) || + || (−10 + 100) || + || (−1 + 10)

|   || = || {{Rn|MMM}} || + || {{Rn|CM}} || + || {{Rn|XC}} || + || {{Rn|IX}}

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なお、手書きでは、[[大文字]]のローマ数字は上下の[[セリフ (文字)|セリフ]]をつなげて書くことが多い。「V」は上部のセリフをつなぎ、逆三角形（▽）のようになる。小文字ではセリフを書かない。