### Fractions

 ½ a half /ə ‘hɑ:f/ ¼ a quarter /ə ‘kwɔːtə/ ¾ three quarters /θriː ‘kwɔːtəz/ ⅓ a third /ə ‘θɜ:d/ ⅔ two thirds /tu: ‘θɜ:dz/ ⅕ a fifth /ə ‘fɪfθ/ ⅖ two fifths /tu: ‘fɪfθs/ ⅗ three fifths /θriː ‘fɪfθs/ ⅘ four fifths /fɔː ‘fɪfθs/ ⅙ a sixth /ə ‘sɪksθ/ ⅚ five sixths /faɪv ‘sɪksθs/ ⅛ an eighth /ən ‘eɪtθ/ ⅜ three eighths /θriː ‘eɪtθs/ ⅝ five eighths /faɪv ‘eɪtθs/ ⅞ seven eighths /sevən ‘eɪtθs/

### Decimal Fractions

 0.1 nought point one /nɔ:t pɔɪnt wʌn/ 0.01 nought point oh one /nɔ:t pɔɪnt əʊ wʌn/ 0.0001 nought point oh oh oh one /ten pɔɪnt əʊ əʊ əʊ wʌn/ 1.1 one point one /wʌn pɔɪnt wʌn/ 1.2 one point two /wʌn pɔɪnt tu:/ 1.23 one point two three /wʌn pɔɪnt tu: θri:/ 1.0123 one point oh one two three /wʌn pɔɪnt əʊ wʌn tu: θri:/ 10.01 ten point oh one /ten pɔɪnt əʊ wʌn/ 21.57 twenty-one point five seven /’twentɪ wʌn pɔɪnt faɪv ‘sevən/ 2.6666666666…. two point six recurring /tu: pɔɪnt sɪks rɪ’kɜ:rɪŋ/ 2.612361236123… two point six one two three recurring /tu: pɔɪnt sɪks wʌn tu: θri: rɪ’kɜ:rɪŋ/ 2.5 million two point five million /tu: pɔɪnt faɪv ‘mɪljən/

### SI Units: Prefixes

PrefixSymbol10nLong/Short Scale
yotta (gr. Okto – eight)Y1024Quadrillion/Septillion
zetta (lat. Septem – seven)Z1021Trilliard/Sextillion
eksa (gr. Ex – six)E1018Trillion/Quintillion
peta (gr. Penta – five)P1015Billiard/Quadrillion
tera (gr. Teras – monster)T1012Billion/Trillion
giga (gr. Gigas – giant)G109Milliard/Billion
mega (gr. Megas – great)M106Million/Million
kilo (gr. Khilioi – thousand)k10³Thousand/Thousand
hecto (gr. Hekaton – hundred)h10²Hundred/Hundred
deca (gr. Deka – ten)da101Ten/Ten
100One/One
decy (lat. Decimus – tenth)d10-1Tenth/Tenth
centy (lac. Centum – hundredth)c10-2Hundredth/Hundredth
milli (lac. Mille – thousand)m10-3Thousandth/Thousandth
mikro (gr. Mikros – small)µ10-6Millionth/Millionth
nano (gr. Nanos – dwarf)n10-9Milliardth/Billionth
pico (it. Piccolo – small)p10-12Billionth/Trillionth
femto (den. Femten – fifteen)f10-15Billiardth/Quadrillionth
atto (den. Atten – eighteen)a10-18Trillionth/Quintillionth
zepto (lat.

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Septem – seven)
z10-21Trilliardth/Sextillionth
yokto (gr. Okto – eight)y10-24Quadrillionth/Septillionth

### Cardinal Numbers

 1 one /wʌn/ 2 two /tu:/ 3 three /θri:/ 4 four /fɔː/ 5 five /faɪv/ 6 six /sɪks/ 7 seven /’sevən/ 8 eight /eɪt/ 9 nine /naɪn/ 10 ten /ten/ 11 eleven /ɪ’levən/ 12 twelve /twelv/ 13 thirteen /θɜ:’ti:n/ 14 fourteen /fɔː’ti:n/ 15 fifteen /fɪf’ti:n/ 16 sixteen /sɪkst’i:n/ 17 seventeen /seven’ti:n/ 18 eighteen /eɪ’ti:n/ 19 nineteen /naɪn’ti:n/ 20 twenty /’twentɪ/ 21 twenty-one /twentɪ’wʌn/ 22 twenty-two /twentɪ’tu:/ 23 twenty-three /twentɪ’θri:/ 24 twenty-four /twentɪ’fɔː/ 25 twenty-five /twentɪ’faɪv/ 26 twenty-six /twentɪ’sɪks/ 27 twenty-seven /twentɪ’sevən/ 28 twenty-eight /twentɪ’eɪt/ 29 twenty-nine /twentɪ’naɪn/ 30 thirty /’θɜ:tɪ/ 40 forty /’fɔːtɪ/ 50 fifty /’fɪftɪ/ 60 sixty /’sɪkstɪ/ 70 seventy /’sevəntɪ/ 80 eighty /’eɪtɪ/ 90 ninety /’naɪntɪ/ 100 a hundred; one hundred /ə ‘hʌndrəd/ /wʌn ‘hʌndrəd/ 101 a hundred and one /ə ‘hʌndrəd ən wʌn/ 102 a hundred and two /ə ‘hʌndrəd ən tu:/ 110 a hundred and ten /ə ‘hʌndrəd ən ten/ 120 a hundred & twenty /ə ‘hʌndrəd ən ‘twentɪ/ 200 two hundred /tu: ‘hʌndrəd/ 300 three hundred /θri: ‘hʌndrəd/ 400 four hundred /fɔː ‘hʌndrəd/ 500 five hundred /faɪv ‘hʌndrəd/ 600 six hundred /sɪks ‘hʌndrəd/ 700 seven hundred /’sevən ‘hʌndrəd/ 800 eight hundred /eɪt ‘hʌndrəd/ 900 nine hundred /naɪn ‘hʌndrəd/ 1 000 a thousand, one thousand /ə θ’ɑʊzənd/ /wʌn ‘θɑʊzənd/ 1 001 a thousand và one /ə ‘θɑʊzənd ən wʌn/ 1 010 a thousand và ten /ə ‘θɑʊzənd ən ten/ 1 020 a thousand và twenty /ə ‘θɑʊzənd ən ‘twentɪ/ 1 100 one thousand, one hunded /wʌn ‘θɑʊzənd wʌn ‘hʌndrəd/ 1 101 one thousand, one hundred và one /wʌn ‘θɑʊzənd wʌn ‘hʌndrəd ən wʌn/ 1 110 one thousand, one hundred and ten /wʌn ‘θɑʊzənd wʌn ‘hʌndrəd ən ten/ 9 999 nine thousand, nine hundred and ninety-nine /naɪn ‘θɑʊzənd naɪn ‘hʌndrəd ən ‘naɪntɪ ‘naɪn/ 10 000 ten thousand /ten ‘θɑʊzənd/ 15 356 fifteen thousand, three hundred and fifty six /’fɪfti:n ‘θɑʊzənd θri: ‘hʌndrəd ən ‘fɪftɪ sɪks/ 100 000 a hundred thousand /ə ‘hʌndrəd ‘θɑʊzənd/ 1 000 000 a million /ə ‘mɪljən/ 100 000 000 a hundred million /ə ‘hʌndrəd ‘mɪljən/ 1 000 000 000 a billion /ə ‘bɪljən/ 100 000 000 000 a hundred billion /ə ‘hʌndrəd ‘bɪljən/ 1 000 000 000 000 a trillion /ə ‘trɪljən/ 1 000 000 000 000 000 a quadrillion /ə kwɒdrɪljən/ 1 000 000 000 000 000 000 a quintillian /ə kwɪn’tɪljən/ 1 000 000 000 000 000 000 000 a sextillion /ə seks’tɪljən/ 1 000 000 000 000 000 000 000 000 a septillion /ə sep’tɪljən/ 1 000 000 000 000 000 000 000 000 000 an ocillion /ən ɒkt’tɪljən/ 1 000 000 000 000 000 000 000 000 000 000 a nonillion /ə nɒn’ɪljən/ 1 000 000 000 000 000 000 000 000 000 000 000 a decillion /ə de’sɪljən/

### Ordinal Numbers

 1st first /fɜ:st/ 2nd second /’sekənd/ 3rd third /θɜ:d/ 4th fourth /fɔ:θ/ 5th fifth /fɪfθ/ 6th sixth /sɪksθ/ 7th seventh /’sevənθ/ 8th eighth /eɪtθ/ 9th ninth /naɪnθ/ 10th tenth /tenθ/ 11th eleventh /ɪ’levənθ/ 12th twelfth /’twelfθ/ 13th thirteenth /θɜ:’ti:nθ/ 14th fourtheenth /fɔː’ti:nθ/ 15th fidteenth /fɪf’ti:nθ/ 16th sixteenth /sɪks’ti:nθ/ 17th seventeenth /seven’ti:nθ/ 18th eighteenth /eɪ’ti:nθ/ 19th nineteenth /naɪn’ti:nθ/ 20th twentieth /’twentɪəθ/ 21st twenty-first /twentɪ’fɜ:st/ 22nd twenty-second /twentɪ’sekənd/ 23rd twenty-third /twentɪ’θɜ:d/ 24th twenty-fourth /twentɪ’fɔ:θ/ 25th twenty-fifth /twentɪ’fɪfθ/ 26th twenty-sixth /twentɪ’sɪksθ/ 27th twenty-seventh /twentɪ’sevənθ/ 28th twenty-eighth /twentɪ’eɪtθ/ 29th twenty-ninth /twentɪ’naɪnθ/ 30th thirtieth /’θɜːtɪəθ/ 31st thirty-first /θɜːtɪ’fɜ:st/ 40th fortieth /’fɔ:tɪəθ/ 50th fiftieth /’fɪftɪəθ/ 100th hundredth /’hʌndrədθ/ 1 000th thousandth /’θɑʊzəndθ/ 1 000 000th miilionth /’mɪljənθ/

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