just as 10 = X in roman numerals what is equivalent of 9999?
218547
9999 = MMMMMMMMMCMXCIX\n\nExplaining:\n\nsince 1000=M\nand 100=C\nalso 10=X as you mentioned\nand  1=I\nThen 9999=9*1000(that is 9 M's)\n          +900 (that is 1000-100=CM)\n          +90 (that is 100-10=XC)\n          +9 (that is 10-1=IX)\n\nNote:In Roman Numerals; symbol represnts small No. to the rigt of Larger one is to be added while to the left of it is to be subtracted (Example: I=1 V=5 then 6=VI while 4=IV).
293289
0123456789\n6210001000\n\nHere you can see there are 6 zeros, 2 ones, 1 two, and 1 six.\n\nI suppose you were looking for something more like this though.\n1234567890\n2100010006\n\nFor those of you with the 1000.0008 solution, where is the 1 8?  I suspect that solution is incorrect.
524691
0.3333... = 1/3\n\nMultiply both sides by 3\n0.9999... = 3/3 = 1\n\nOr\n0.3333... = 1/3\n0.3333... + 0.3333... + 0.3333... = 1/3 + 1/3 + 1/3\n0.9999... = 1\n\nOr:\nx = 0.9999....\n10x = 9.9999...\n10x - x = 9\n9x = 9\nx = 1\n\nSo 0.9999... = 1
253777
To start, I'm guessing you meant for the second choice to be 1000, not 100.  In that case the answer is 900.\n\nEven better, I can tell you why John likes those numbers.  They are all perfect squares of numbers ending in zero.\n\n10^2=100\n20^2=400\n30^2=900\n60^2=3600
328005
I agree with chapin4ever's answer.\nand the three digit number is the ASCII equivalent of the symbol.
14300
If we were to want to go to 10\n(1+2+3+4+5+6+7+8+9+10=55)\nthen you could use the following idea:\n1+9 = 10\n2+8 = 10\n3+7 = 10\n4+6 = 10\n5+0 = 5\n10+0 = 10\nOr \n1+2+3+4+5+6+7+8+9+10= 55\nOr (10/2)*10 + 10/2 = 55\n\nSo unless my math is wrong, you could do the same for 10000:\n1+9999 = 10000\n2+9998 = 10000\nEtc…\nOr\n(10000/2)*10000 + 10000/2 = 50,005,000\n\nThis is more commonly written out\n(n+1)*n/2
117530
FORTY\n+ TEN\n+ TEN\n--------\nSIXTY\n\n\n29786\n+ 850\n+ 850\n--------\n31486
88914
Only a few answers are possible. One of those is 18, which is used in the example.  All of the possible answers have the same symbol as 18.\n\nSorry, I don't know how to prove this, but try a few examples, always comparing the symbol representing your result to the symbol representing 18.\n\nOkay, I figured it out. \n\nState the puzzle another way:\n\nChoose two one-digit numbers, x and y.\n\nCalculate 10x + y - x - y = 9x\n\nThe result of every calculation is merely 9x.\n\nIn the chart, every multiple of 9 is represented by the same symbol, so no matter what numbers you choose, you get the same symbol.  \n\nWhen you click on the "Click here to try again" link, it merely redraws the table with a different symbol representing the multiples of 9.
52678
I+I=II in Roman numerals...\n1+1=10 in binary...\n1+1=4 when you are adding amplitudes in phase (waves)\n26 in Base32 (Not 100% certain on this one though.)\nAnd as an engineer would tell you, 1+1= 3 for very large values of 1.
246031
okay so if you just subsitute the symbols w/the numbers then your answer would be 35 x 96 + 6640 = 10,000.
96690
its easy to do the math.\n\n10*10*10*10 for the first one so 10000\n\n\n10*10*10*10*10 for the second one which is 100000\n\ndiffrent posibilities
508517
SOLUTION WITH WORKING\n----------------------------------------\nSince it is a 2 digit number,say xy i.e.(10x+y in mathematical terms) ,where x is tens' place and y is units'\n\nThe given information says:\n  \n6(x+y) = (10*x)+y\nSo,\n\n6x+6y=10x+y\n4x=5y\n\nIn the given region(10 to 99),searching integer values of x and y,\nwe gwt\nx=5 and y=4 \n\n(Next solution comes when x=10,y=8  but x is single digit number hence this and all further possibilities get discarded.)\n\nHENCE the number is xy=54
556388
X*10 + 1 = 3*(X + 10^5)\n(10-3)*X = 300000-1\n7*X = 299999\nX = 42857
40820
d= {R/ x=4}\nall real numebrs, except x= 4
471109
binary: 1011\nhexadecimal: b\noctal: 13\ndecimal: 11\nroman numerals: xi\nspelled out in english:  eleven\nspelled out in spanish: once\n(you could do various languages, but that seems cheap... 2 is plenty)\nscientific notation: 1.1 x 10^1\nfraction: 11/1\nexponential: 11^1
199631
Yes, and don't forget, when rounding raise to next highest if following digit is 5 or more...38.90952 = 38.910 if rounded to 1000ths.
659308
0000, 0001, 0002, 0003, 0004, 0005, 0006, 0007, 0008, 0009, 0010, 0011... etc, etc  untill u get to 9998, 9999\n\ntry it out, might take a long time but one combination will work :))