Adding with Roman numerals: XV + VIII
22 October 2026
Worked example
XV + VIII
Step 1: Change each numeral to numbers. XV is 10 + 5 = 15. VIII is 5 + 3 = 8.
Step 2: Add the numbers. 15 + 8 = 23.
Step 3: Change 23 back to Roman numerals. 20 is XX and 3 is III. So, 23 is XXIII.
The correct answer is XXIII.
