45 subtracted from184 = -139
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15-60= -45
60 -15 = 45
XLV = 45 Added: True, but not explanatory. X = 10 L = 50 V = 5 This is the clumsy Roman numeral way to say 45. 10 subtracted from 55 = 45. Not handy! That is why Arabic numerals were accepted so quickly.
The subtrahend is subtracted from the minuend
2010 subtracted from1981 = 29