46
XLVI = 46
I=1
V=5
X=10
L=50
When L (50) is preceeded by X (10) you deduct 10 from 50 to get 40. V adds 5 and I adds 1 giving you 46.
In constructing roman numerals, if a smaller number preceedes a larger number, you subtract it's value from the larger number. Numbers are not generally repeated more than 3 times in a row. Below is a counting example.
I = 1
II = 2
III = 3
IV = 4
V = 5
VI = 6
VII = 7
VIII = 8
IX = 9
X = 10
XI = 11
XII = 12
XIII = 13
XIV = 14
XV = 15
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The equivalent Roman numeral for 2015 is MMXV
2013 in Roman numerals is MMXIII
Xlv
MMXI
XLVI