Roman Numerals — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Use the subtraction rule: 4 in Roman numerals is IV.
When I sits before V, we subtract one from five, giving four.
2. Write 9 in Roman numerals using the rule: IX.
I before X means ten minus one, which equals nine.
3. The Roman numeral XL stands for 40.
Subtraction pairs use a smaller letter before a larger to mean subtract.
4. Convert XXVII to a number: 27.
Reading left to right we add 10+10+5+1+1, which totals twenty-seven.
5. Write 14 in Roman numerals: XIV.
Ten plus four uses X for ten and IV for four, giving XIV.
6. Read XLII as a regular number: 42.
Forty plus two equals forty-two when XL is followed by II.
7. Write 19 in Roman numerals: XIX.
X for ten and IX for nine combine to make XIX, which equals nineteen.
8. The Roman numeral L equals 50.
L is one of the seven base Roman symbols and represents fifty exactly.
9. Convert 49 to Roman numerals: XLIX.
Forty is XL and nine is IX, so XLIX represents forty-nine cleanly.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
IV
→ 4
4
IX
→ 9
9
XL
→ 40
40
XLIX
→ 49
49
Each pair shows how a smaller symbol before a larger one signals subtraction.