Hierarchy of Decimal Numbers

Number
Name
How many
0zero 
1one
2two 
3three  
4four   
5five    
6six     
7seven      
8eight       
9nine        
10ten         
20twentytwo tens
30thirtythree tens
40fortyfour tens
50fiftyfive tens
60sixtysix tens
70seventyseven tens
80eightyeight tens
90ninetynine tens

NumberNameHow Many
100one hundredten tens
1,000one thousandten hundreds
10,000ten thousandten thousands
100,000one hundred thousandone hundred thousands
1,000,000one millionone thousand thousands
Some people use a comma to mark every 3 digits. It just keeps track of the digits and makes the numbers easier to read.
Beyond a million, the names of the numbers differ depending where you live. The places are grouped by thousands in America and France, by the millions in Great Britain and Germany.
NameAmerican-FrenchEnglish-German
million1,000,0001,000,000
billion1,000,000,000 (a thousand millions)1,000,000,000,000 (a million millions)
trillion1 with 12 zeros1 with 18 zeros
quadrillion1 with 15 zeros1 with 24 zeros
quintillion1 with 18 zeros1 with 30 zeros
sextillion1 with 21 zeros1 with 36 zeros
septillion1 with 24 zeros1 with 42 zeros
octillion1 with 27 zeros1 with 48 zeros
googol
1 with 100 zeros
googolplex
1 with a googol of zeros

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