Here’s the breakdown of the Roman numeral MMMDCCXXXVIII:

• M represents 1000 in Roman numerals.
• M represents 1000 in Roman numerals.
• M represents 1000 in Roman numerals.
• D represents 500 in Roman numerals.
• C represents 100 in Roman numerals.
• C represents 100 in Roman numerals.
• X represents 10 in Roman numerals.
• X represents 10 in Roman numerals.
• X represents 10 in Roman numerals.
• V represents 5 in Roman numerals.
• I represents 1 in Roman numerals.
• I represents 1 in Roman numerals.
• I represents 1 in Roman numerals.

Now, let’s add them together:

M (1000) + M (1000) + M (1000) + D (500) + C (100) + C (100) + X (10) + X (10) + X (10) + V (5) + I (1) + I (1) + I (1) = 3000 + 500 + 200 + 30 + 5 + 3 = 3738

So, MMMDCCXXXVIII is equal to 3,738 in decimal notation.

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