49,100,000 or forty-nine million, one hundred thousand.
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491-500: cdxci, cdxcii, cdxciii, cdxciv, cdxcv, cdxcvi, cdxcvii, cdxcviii, cdxcix, d
You write 8.8 million as 8,800,000
XDI - D=500, X=10 and I=1... Placing the X before the D means you subtract it from the larger number, then add the 1. Another (longer) way to write it would be CCCLXXXIX (100+100+100+50+10+10+10+9)Additional Information:-In today's notation of Roman numerals 491 is: CDXCIBut the Romans themselves would have worked out 491 as CCCCLXXXXI and then simplified it to XDI (501-10 = 491) which uses less numerals but of equal value
491-216 = 275
To write 20.5 million numerically, you would write it as 20,500,000.