document.write( "Question 800755: Which numbers do the following Roman numerals denote?
\n" ); document.write( " XX, XXV, XXII, XXIX \n" ); document.write( "
Algebra.Com's Answer #483249 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "I=1 , V=5, X=10,  L=50,  C=100,  D=500,  M=1000 \r\n" );
document.write( "\r\n" );
document.write( "There are three basic principles for reading and writing Roman numerals:\r\n" );
document.write( "\r\n" );
document.write( "1. A letter repeats its value that many times. A letter can only be repeated three times. \r\n" );
document.write( "\r\n" );
document.write( "2. If one or more letters are placed after another letter of greater value, add that amount. \r\n" );
document.write( "\r\n" );
document.write( "3. If a letter is placed before another letter of greater value, subtract that amount. \r\n" );
document.write( "\r\n" );
document.write( "Several rules apply for subtracting amounts from Roman numerals:a. \r\n" );
document.write( "\r\n" );
document.write( "a. Only subtract powers of ten (I, X, or C, but not V or L)\r\n" );
document.write( "b. Only subtract one number from another.\r\n" );
document.write( "c. Do not subtract a number from one that is more than 10 times greater\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "XX  That repeats X=10 twice, so by rule 1, that is 10+10 or 20\r\n" );
document.write( "\r\n" );
document.write( "XXV  That has a V=5 after XX, so by rule 2, we add that amount 20+5=25  \r\n" );
document.write( "\r\n" );
document.write( "XXII  That has a II=2 after XX, so by rule 2, we add that amount 20+2=22\r\n" );
document.write( "\r\n" );
document.write( "XXIX  That has IX after XX, and the I before the X in IX means that by rule 3,\r\n" );
document.write( "      we subtract 1 from the X=10 and get 9, so we add 20+9 = 29\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );