Explanation:
We are asked to subtract Roman numerals and give the answer in Roman numerals.
First, recall the values of basic Roman numerals:
- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000
Also remember subtraction rules (e.g., IV = 4, IX = 9, XL = 40, etc.), but for subtraction problems like XIV − IX, it’s safest to convert both numbers to Arabic (base-10), subtract, then convert back to Roman.
Let’s solve each problem one by one:
1. XIV − IX
XIV = 14, IX = 9 → 14 − 9 = 5 → V
2. XXIV − V
XXIV = 24, V = 5 → 24 − 5 = 19 → XIX
3. XXV − X
XXV = 25, X = 10 → 25 − 10 = 15 → XV
4. XXIV − V
Same as #2 → 24 − 5 = 19 → XIX
5. XIX − VIII
XIX = 19, VIII = 8 → 19 − 8 = 11 → XI
6. X − I
10 − 1 = 9 → IX
7. XII − IV
XII = 12, IV = 4 → 12 − 4 = 8 → VIII
8. XX − VII
XX = 20, VII = 7 → 20 − 7 = 13 → XIII
9. XVI − XIV
XVI = 16, XIV = 14 → 16 − 14 = 2 → II
10. XXIV − XI
XXIV = 24, XI = 11 → 24 − 11 = 13 → XIII
11. XXIV − VI
24 − 6 = 18 → XVIII
12. XVII − I
17 − 1 = 16 → XVI
13. XXI − XV
XXI = 21, XV = 15 → 21 − 15 = 6 → VI
14. XVI − VI
16 − 6 = 10 → X
15. XXIII − XVII
XXIII = 23, XVII = 17 → 23 − 17 = 6 → VI
16. XXI − III
21 − 3 = 18 → XVIII
17. VI − III
6 − 3 = 3 → III
18. II − I
2 − 1 = 1 → I
19. XVI − III
16 − 3 = 13 → XIII
20. XVI − VII
16 − 7 = 9 → IX
Let me double-check a few tricky ones:
- #2 and #4: XXIV = 10+10+4 = 24, minus 5 = 19 = XIX
✔
- #5: XIX = 19, VIII = 8 → 11 = XI
✔
- #7: XII = 12, IV = 4 → 8 = VIII
✔
- #15: XXIII = 23, XVII = 17 → 6 = VI
✔
- #20: XVI = 16, VII = 7 → 9 = IX
✔
All look correct.
Final Answer:
1. V
2. XIX
3. XV
4. XIX
5. XI
6. IX
7. VIII
8. XIII
9. II
10. XIII
11. XVIII
12. XVI
13. VI
14. X
15. VI
16. XVIII
17. III
18. I
19. XIII
20. IX
Parent Tip: Review the logic above to help your child master the concept of roman numeral addition worksheet.
