The Roman numeral for nine is IX. X is 10 and I is 1. When the I is before the X you subtract.
Subtract negative 3.
11
5
5/10 - 4/10 = 1/10
10
The Roman numeral for nine is IX. X is 10 and I is 1. When the I is before the X you subtract.
The idea is to subtract 1/2 minus 9/10 (or the other way round).
0.9
1 and nine eighteens
Subtract negative 3.
Six Nine Nine
11
21/9 - 1/2 = 1.8333
1. Subtract 25 2. Then subtract 6 3. Then subtract 12 4. Then subtract 2 5. Then subtract 10 6. Then subtract 15 7. Then subtract 7 8. Then add 3 X 1/2 9. Then add 8
5
5/10 - 4/10 = 1/10