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Add together the individual numerals (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1) unless a smaller numeral precedes a larger one in which case subtract it from the larger ones. When a letter has a bar over it it is multiplied by 1000

→ 400000 = 400 × 1000 = (-100 + 500) × 1000 = CD with a bar over both letters:

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CD

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Q: How do you write 400000 in roman numerals?
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