841
400 + 41 = 441
841 minus 441 is 400.
400
Well, 441=400+40+1. Therefore, 441 would be CD (400, or 500-100) XL (40, or 50-10) I (1). That's CDXLI.
641
450
-897
The square root of 400 is 20, and the square root of 450 is approximately 21.21. Therefore, the square number between 400 and 450 is 441, which is the square of 21.
The answer is 21. 21 X 21=441 and that's between 400 and 450
(((800 plus 400) plus 400) plus 500) plus 500 = 2600
plus or minus 21
nothing special, plain 400 heads comparable to 441 993 487