Let's solve this step-by-step.
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Part 1: Convert Roman Numerals to Numbers
We are given the basic Roman numeral values:
- I = 1
- V = 5
- X = 10
Rules to remember:
- When a smaller numeral appears before a larger one, subtract it (e.g., IV = 5 - 1 = 4).
- When a smaller numeral follows a larger one, add it (e.g., VI = 5 + 1 = 6).
Now, let’s solve each:
1)
II = 1 + 1 =
2
2)
V =
5
3)
IV = 5 - 1 =
4
4)
X =
10
5)
III = 1 + 1 + 1 =
3
6)
VI = 5 + 1 =
6
7)
XI = 10 + 1 =
11
8)
IX = 10 - 1 =
9
9)
XII = 10 + 1 + 1 =
12
10)
XV = 10 + 5 =
15
11)
XX = 10 + 10 =
20
12)
XIX = 10 + (10 - 1) = 10 + 9 =
19
13)
XVII = 10 + 5 + 1 + 1 =
17
14)
XIV = 10 + (5 - 1) = 10 + 4 =
14
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Part 2: Convert Numbers to Roman Numerals
Now we go backwards: convert numbers to Roman numerals using the same rules.
1)
1 =
I
2)
3 = 1 + 1 + 1 =
III
3)
10 =
X
4)
5 =
V
5)
6 = 5 + 1 =
VI
6)
11 = 10 + 1 =
XI
7)
4 = 5 - 1 =
IV
8)
15 = 10 + 5 =
XV
9)
20 = 10 + 10 =
XX
10)
13 = 10 + 3 = 10 + 1 + 1 + 1 =
XIII
11)
17 = 10 + 5 + 2 = 10 + 5 + 1 + 1 =
XVII
12)
12 = 10 + 2 = 10 + 1 + 1 =
XII
13)
18 = 10 + 8 = 10 + 5 + 3 = 10 + 5 + 1 + 1 + 1 =
XVIII
14)
14 = 10 + 4 = 10 + (5 - 1) =
XIV
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✔ Final Answers:
####
Part 1: Roman to Number
1) II =
2
2) V =
5
3) IV =
4
4) X =
10
5) III =
3
6) VI =
6
7) XI =
11
8) IX =
9
9) XII =
12
10) XV =
15
11) XX =
20
12) XIX =
19
13) XVII =
17
14) XIV =
14
####
Part 2: Number to Roman Numeral
1) 1 =
I
2) 3 =
III
3) 10 =
X
4) 5 =
V
5) 6 =
VI
6) 11 =
XI
7) 4 =
IV
8) 15 =
XV
9) 20 =
XX
10) 13 =
XIII
11) 17 =
XVII
12) 12 =
XII
13) 18 =
XVIII
14) 14 =
XIV
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This worksheet helps build understanding of how Roman numerals work — especially the subtraction rule (like IV = 4, IX = 9). Great practice for early math learners! 🎉
Parent Tip: Review the logic above to help your child master the concept of roman numeral addition worksheet.
