Let’s solve each problem step by step. We’ll convert Roman numerals to regular numbers, add them, then convert the answer back to Roman numerals.
We can use the chart at the top of the sheet for help:
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
XXX = 30
XXXI = 31
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 30 is XXX, and 6 is VI)
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6) XX + XX
XX = 20
20 + 20 =
40 → XL
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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 (40 is XL, 2 is II)
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11) XXXI + XV
XXXI = 31
XV = 15
31 + 15 =
46 → XLVI (40 is XL, 6 is VI)
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12) XXV + IX
XXV = 25
IX = 9
25 + 9 =
34 → XXXIV
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13) XIV + IX
XIV = 14
IX = 9
14 + 9 =
23 → XXIII
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14) XX + XXIII
XX = 20
XXIII = 23
20 + 23 =
43 → XLIII (40 is XL, 3 is III)
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15) XXII + XVI
XXII = 22
XVI = 16
22 + 16 =
38 → XXXVIII (30 is XXX, 8 is VIII)
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16) XXXIV + XV
XXXIV = 34
XV = 15
34 + 15 =
49 → XLIX (40 is XL, 9 is IX)
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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 free roman numeral worksheet.
