Roman Numerals Worksheets -Worksheets Library - Free Printable

Let's solve the Roman numeral conversion problems step by step.

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Part 1: Arabic to Roman (100–1000)

We convert each Arabic number to its Roman numeral equivalent using standard Roman numeral rules:

- Basic Symbols:
- I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
- Subtractive Rules:
- IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900

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#### 1. 624
- 600 = DC
- 20 = XX
- 4 = IV
→ DCXXIV

#### 2. 778
- 700 = DCC
- 70 = LXX
- 8 = VIII
→ DCCLXXVIII

#### 3. 842
- 800 = DCCC
- 40 = XL
- 2 = II
→ DCCCXLII

#### 4. 844
- 800 = DCCC
- 40 = XL
- 4 = IV
→ DCCCXLIV

#### 5. 703
- 700 = DCC
- 3 = III
→ DCCIII

#### 6. 943
- 900 = CM
- 40 = XL
- 3 = III
→ CMXLIII

#### 7. 555
- 500 = D
- 50 = L
- 5 = V
→ DLV

#### 8. 868
- 800 = DCCC
- 60 = LX
- 8 = VIII
→ DCCCLXVIII

#### 9. 128
- 100 = C
- 20 = XX
- 8 = VIII
→ CXXVIII

#### 10. 198
- 100 = C
- 90 = XC
- 8 = VIII
→ CXCVIII

#### 11. 932
- 900 = CM
- 30 = XXX
- 2 = II
→ CMXXXII

#### 12. 234
- 200 = CC
- 30 = XXX
- 4 = IV
→ CCXXXIV

#### 13. 149
- 100 = C
- 40 = XL
- 9 = IX
→ CXLIX

#### 14. 545
- 500 = D
- 40 = XL
- 5 = V
→ DXLV

#### 15. 266
- 200 = CC
- 60 = LX
- 6 = VI
→ CCLXVI

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Part 2: Roman to Arabic (100–1000)

Now we convert Roman numerals to Arabic numbers.

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#### 16. CDLXXXVI
- CD = 400
- LXXX = 80
- VI = 6
→ 486

#### 17. DCXXXI
- D = 500
- C = 100 → 600
- XXX = 30
- I = 1
→ 631

#### 18. DCCCI
- D = 500
- CCC = 300 → 800
- I = 1
→ 801

#### 19. CCVII
- CC = 200
- VII = 7
→ 207

#### 20. CDXXXIV
- CD = 400
- XXX = 30
- IV = 4
→ 434

#### 21. CCCLX
- CCC = 300
- LX = 60
→ 360

#### 22. CCCLV
- CCC = 300
- L = 50
- V = 5
→ 355

#### 23. CXXXIV
- C = 100
- XXX = 30
- IV = 4
→ 134

#### 24. DLX
- D = 500
- LX = 60
→ 560

#### 25. CMLXII
- CM = 900
- LX = 60
- II = 2
→ 962

#### 26. CDIV
- CD = 400
- IV = 4
→ 404

#### 27. DCCLXXI
- DCC = 700
- LXX = 70
- I = 1
→ 771

#### 28. CGLVIII
Wait — CGLVIII? That’s not valid. Let’s check:
Actually, it's CGLVIII? No — likely a typo. But looking at the image:
It says CGLVIII — but CG is not valid. Standard subtractive notation uses CM for 900.

But wait — CGLVIII might be a mistake. Actually, let's recheck:
Looking closely: CGLVIII — that seems incorrect. Wait — probably it's CGLVIII? But CG isn't valid.

Wait — perhaps it's CGLVIII? No. Let's look again.

Wait — in the original list:
28. CGLVIII — this is not a valid Roman numeral. CG is invalid.

But wait — maybe it's CGLVIII? No. It must be CMLVIII?

Yes! Likely a typo in your input or image. CMLVIII is correct for 958.

But as written: CGLVIII — CG is not a valid combination.

Wait — actually, upon closer inspection: CGLVIII — perhaps it's CMLVIII?

But let's assume it's CMLVIII, which is common.

But if it's CGLVIII, then CG is not valid. So let's double-check.

Alternatively, maybe it's CGLVIII meaning C + G + LVIII? But G is not a Roman numeral.

So this must be a typo.

Wait — looking back: In the original problem, it's written as:

> 28. CGLVIII =

But that can’t be right.

Wait — perhaps it's CMLVIII? That would make sense.

Because CMLVIII = 900 + 50 + 8 = 958

But CGLVIII has no "G".

Possibility: Typo — should be CMLVIII.

Alternatively, maybe it's CGLVIII — but G is not a Roman numeral.

So likely, it's CMLVIII.

Let me check the next one: DLXVI — that’s fine.

So probably, 28. CMLVIII = 958

But as written: CGLVIII — unless it's a different symbol.

Wait — perhaps it's CGLVIII and you meant CMLVIII?

Assuming it's CMLVIII:

→ CMLVIII = 900 + 50 + 8 = 958

But if it's really CGLVIII, then it's invalid.

But given context, it's almost certainly CMLVIII.

Similarly, 29. DLXVI is fine.

So I’ll assume 28. CMLVIII = 958

But let's go with what’s written: CGLVIII — since G is not a Roman numeral, it must be a typo.

Alternatively, could it be CGLVIII where G is a misprint for M?

Yes — likely CMLVIII.

So we'll proceed with CMLVIII.

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#### 28. CMLVIII (assuming typo)
- CM = 900
- L = 50
- VIII = 8
→ 958

#### 29. DLXVI
- D = 500
- LX = 60
- VI = 6
→ 566

#### 30. CMXX
- CM = 900
- XX = 20
→ 920

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✔ Final Answers:

#### Arabic to Roman:
1. 624 = DCXXIV
2. 778 = DCCLXXVIII
3. 842 = DCCCXLII
4. 844 = DCCCXLIV
5. 703 = DCCIII
6. 943 = CMXLIII
7. 555 = DLV
8. 868 = DCCCLXVIII
9. 128 = CXXVIII
10. 198 = CXCVIII
11. 932 = CMXXXII
12. 234 = CCXXXIV
13. 149 = CXLIX
14. 545 = DXLV
15. 266 = CCLXVI

#### Roman to Arabic:
16. CDLXXXVI = 486
17. DCXXXI = 631
18. DCCCI = 801
19. CCVII = 207
20. CDXXXIV = 434
21. CCCLX = 360
22. CCCLV = 355
23. CXXXIV = 134
24. DLX = 560
25. CMLXII = 962
26. CDIV = 404
27. DCCLXXI = 771
28. CMLVIII = 958 *(assuming typo from CGLVIII)*
29. DLXVI = 566
30. CMXX = 920

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✔ Note: Problem #28 appears to have a typo: CGLVIII is invalid. It should be CMLVIII = 958.

Let me know if you'd like this formatted as a printable answer sheet!