Question

Explain how addition and subtraction were used to derive the roman numerals below
1.IV
2.VI
3.XIX
4.LXIV
5.XCIX

Answer 1

1. $IV=5-1=4$

2. $VI=5+1=6$

3. $XIX=10+(10-1)=10+9=19$

4. $LXIV=50+10+(5-1)=60+4=64$

5. $XCIX=(100-10)+(10-1)=90+9=99$