## NAMING LARGE NUMBERS

To name a large number, first change the number into one which is expressed as N x 10n, where n is a multiple of 3 and N is between 1 and 999 (starting at the end of the number, use commas to break the number up into groups of three digits). Read N in the normal fashion, followed by the correct word from the list below for the rest of the number. (If the power of 10 is larger than 120, proceed to the bottom of the page.)

Example: 45000000000000000000000000000000000000000000
= 45,000,000,000,000,000,000,000,000,000,000,000,000,000,000
= 45 x 1042
= 45 tredecillion

 million 106 billion 109 trillion 1012 quadrillion 1015 quintillion 1018 sextillion 1021 septillion 1024 octillion 1027 nonillion 1030 decillion 1033 undecillion 1036 dodecillion 1039 tredecillion 1042 quattuordecillion 1045 quindecillion 1048 sexdecillion 1051 septendecillion 1054 octodecillion 1057 novemdecillion 1060 vigintillion 1063
 unvigintillion 1066 dovigintillion 1069 trevigintillion 1072 quattuorvigintillion 1075 quinvigintillion 1078 sexvigintillion 1081 septenvigintillion 1084 octovigintillion 1087 novemvigintillion 1090 trigintillion 1093 untrigintillion 1096 dotrigintillion 1099 tretrigintillion 10102 quattuortrigintillion 10105 quintrigintillion 10108 sextrigintillion 10111 septentrigintillion 10114 octotrigintillion 10117 novemtrigintillion 10120
 STEP EXAMPLE Start with a power of ten that is a multiple of three. 102484 Take that power of 10 and subtract 3. 2484 - 3 = 2481 Divide the result by 3. 2481 / 3 = 827 Starting at the end of the quotient, find each of the prefixes in the table below, ones digit first, tens digit next, etc. (The letters in parentheses are explained in the next step.) 7 = septe (mn) 2 = (ms) viginti 8 = (mx) octingenti String the segments together, inserting an extra letter if the letter shown in parentheses at the end of one segment matches a letter in parentheses at the beginning of the next. septemvigintioctingenti (The m was added between septe and viginti because m was in each pair of parentheses.) If the result ends in a, change the a to i. septemvigintioctingenti (Rule doesn't apply here.) Add llion at the end, and you're done! septemvigintioctingentiillion
 digit ones digit tens digit hundreds digit thousands digit 0 1 un (n) deci (nx) centi mille 2 duo (ms) viginti (n) ducenti 3 tre (s) (ns) triginta (ns) trecenti 4 quattuor (ns) quadraginta (ns) quadringenti 5 quinqua (ns) quinquaginta (ns) quingenti 6 se (sx) (n) sexaginta (n) sescenti 7 septe (mn) (n) septuaginta (n) septingenti 8 octo (mx) octoginta (mx) octingenti 9 nove (mn) nonaginta nongenti NOTE: The above is all based on the American system of naming numbers. The British do it differently. To see a comparsion between the two systems, click HERE.