Part 1: Write the Roman numeral for each number:

1. 5 → V

2. 9 → IX

3. 20 → XX

4. 42 → XLII

5. 58 → LVIII

6. 99 → XCIX

7. 144 → CXLIV

8. 205 → CCV

9. 399 → CXX

10. 1000 → M

Part 2: Convert the Roman numeral to a number:

1. XIII → 13

2. XXVII → 27

3. XLIV → 44

4. LXXI → 71

5. CXX → 120

6. CLVIII → 158

7. CXC → 890

8. MCM → 1900

9. CVX → 815

10. MMXXV → 2025

Part 3: Fill in the blanks with the correct Roman numeral:

1. I + I = II

2. V + V = X

3. X + X = XX

4. C - L = L

5. D - C = CD

6. M - D = D

Part 4: True or False:

1. The Roman numeral for 4 is IV. → True

2. The Roman numeral for 100 is D. → False (The Roman numeral for 100 is C.)

3. The Roman numeral for 50 is L. → True

4. The Roman numeral for 9 is VII. → False (The Roman numeral for 9 is IX.)

5. The Roman numeral for 500 is C. → False (The Roman numeral for 500 is D.)

Bonus Question:

Why Roman numerals do not have a symbol for zero:

Roman numerals were developed in ancient Rome and were primarily used for counting and recording quantities. The Roman numeral system is based on adding and subtracting specific values represented by symbols, such as I, V, X, etc. The concept of zero, which represents the absence of quantity, was absent in Roman numeral usage. The system was designed to handle positive numbers and did not require a symbol for zero. Zero was introduced later in other cultures, particularly in ancient India, before being adopted in other parts of the world.

End of Answer Key

Questions

Answer Key: Roman Numerals