Answer to Question #113069 in Math for Felicia Ngubandze

Question #113069

Explain how addition and subtraction were used to derive the Roman numerals below:
1.1.1. IV (4)
1.1.2. VI (6)
1.1.3. XIX (19)
1.1.4. LXIV (64)
1.1.5. XCIX (99)

Expert's answer

1.1.1. IV=5-1=4.

1.1.2. VI=5+1=6.

1.1.3. XIX=10+(10-1)=19.

1.1.4. LXIV=50+10+(5-1)=64.

1.1.5. XCIX=(100-10)+(10-1)=99.

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