9 in Roman numerals, how to write?

9 = IX
Explanations below.

Roman numerals used to make the conversion:

I = 1; X = 10;
Reading rules

9 = 10 - 1 = X - I = IX;

9 = IX

In Roman numerals online converter

Latest conversions of numbers to Roman numerals

9 = IX Sep 20 11:10 UTC (GMT)
7 = VII Sep 20 11:10 UTC (GMT)
27 = XXVII Sep 20 11:10 UTC (GMT)
2,003 = MMIII Sep 20 11:10 UTC (GMT)
11 = XI Sep 20 11:10 UTC (GMT)
7 = VII Sep 20 11:10 UTC (GMT)
2,015 = MMXV Sep 20 11:10 UTC (GMT)
20 = XX Sep 20 11:10 UTC (GMT)
574 = DLXXIV Sep 20 11:10 UTC (GMT)
13 = XIII Sep 20 11:10 UTC (GMT)
40 = XL Sep 20 11:10 UTC (GMT)
22 = XXII Sep 20 11:10 UTC (GMT)
12 = XII Sep 20 11:10 UTC (GMT)
converted numbers, see more...