Let’s solve each problem step by step. We’ll convert Roman numerals to regular numbers, add them, then convert the sum back to Roman numerals.
We can use the reference table at the top of the sheet:
I = 1
II = 2
III = 3
IV = 4
V = 5
VI = 6
VII = 7
VIII = 8
IX = 9
X = 10
XI = 11
XII = 12
XIII = 13
XIV = 14
XV = 15
XVI = 16
XVII = 17
XVIII = 18
XIX = 19
XX = 20
XXI = 21
XXII = 22
XXIII = 23
XXIV = 24
XXV = 25
XXVI = 26
XXVII = 27
XXVIII = 28
XXIX = 29
XXX = 30
XXXI = 31
XXXII = 32
XXXIII = 33
XXXIV = 34
XXXV = 35
XL = 40
XLV = 45
L = 50
Now let’s go one by one:
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2) XII + XI
XII = 12
XI = 11
12 + 11 =
23 → XXIII
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3) XV + XV
XV = 15
15 + 15 =
30 → XXX
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4) XI + IX
XI = 11
IX = 9
11 + 9 =
20 → XX
---
5) XXV + XI
XXV = 25
XI = 11
25 + 11 =
36 → XXXVI (since 35 is XXXV, so 36 is XXXVI)
Wait — our table only goes up to L=50 and includes XXXV=35, but not XXXVI. But we know:
XXX = 30
VI = 6 → so XXXVI = 36 ✔️
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6) XX + XX
XX = 20
20 + 20 =
40 → XL
---
7) XXV + VIII
XXV = 25
VIII = 8
25 + 8 =
33 → XXXIII
---
8) XIV + XI
XIV = 14
XI = 11
14 + 11 =
25 → XXV
---
9) XIX + XII
XIX = 19
XII = 12
19 + 12 =
31 → XXXI
---
10) XXX + XII
XXX = 30
XII = 12
30 + 12 =
42 → XLII (XL = 40, II = 2 → XLII)
---
11) XXXI + XV
XXXI = 31
XV = 15
31 + 15 =
46 → XLVI (XL = 40, VI = 6 → XLVI)
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12) XXV + IX
XXV = 25
IX = 9
25 + 9 =
34 → XXXIV
---
13) XIV + IX
XIV = 14
IX = 9
14 + 9 =
23 → XXIII
---
14) XX + XXIII
XX = 20
XXIII = 23
20 + 23 =
43 → XLIII (XL = 40, III = 3 → XLIII)
---
15) XXII + XVI
XXII = 22
XVI = 16
22 + 16 =
38 → XXXVIII (XXX = 30, VIII = 8 → XXXVIII)
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16) XXXIV + XV
XXXIV = 34
XV = 15
34 + 15 =
49 → XLIX (XL = 40, IX = 9 → XLIX)
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✔ All calculations checked!
Final Answer:
2) 23 = XXIII
3) 30 = XXX
4) 20 = XX
5) 36 = XXXVI
6) 40 = XL
7) 33 = XXXIII
8) 25 = XXV
9) 31 = XXXI
10) 42 = XLII
11) 46 = XLVI
12) 34 = XXXIV
13) 23 = XXIII
14) 43 = XLIII
15) 38 = XXXVIII
16) 49 = XLIX
Parent Tip: Review the logic above to help your child master the concept of roman numeral worksheet for grade 3.
