"9 tens" would be 90.
If you meant to write "9 tenths" the answer would be 0.9
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.9 is the same as 9/10
it's simple 9X10
To write the number 9 in Roman numerals, you would use the symbol 'IX'. This is made by combining the Roman numeral for 1, 'I', and the Roman numeral for 10, 'X', subtracting 1 from 10.