Remember that large numbers are separated by commas: 123,456,789 and decimals need dots: 1.25
MORE DIFFICULT NUMBERS
We don't normally write numbers with words, but it's possible to do this and, of course, this will show how we say the numbers.
In writing large numbers, American English uses a comma ( , ) to separate thousands, millions, etc. American English also uses a hyphen ( - ) to separate "tens" words (twenty, fifty, etc.) and
"ones" words (one, three, six, etc.)
Examples:
written said
1,011 one thousand eleven
21,011 twenty-one thousand eleven
721,011 seven hundred twenty-one thousand eleven
....................................................................................................................................
1,256,721 one million two hundred fifty-six thousand seven hundred twenty-one
31,256,721 thirty-one million two hundred fifty-six thousand seven hundred twenty-one
631,256,721 six hundred thirty-one million two hundred fifty-six thousand seven hundred twenty-one
....................................................................................................................................
1,492,638,526 one billion four hundred ninety-two million six hundred thirty-eight thousand five hundred twenty-six
41,492,638,526 forty-one billion four hundred ninety-two million six hundred thirty-eight thousand five hundred twenty-six
941,492,638,526 nine hundred forty-one billion four hundred ninety-two million six hundred thirty-eight thousand five hundred twenty-six
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NOTES:
- In American English, the order of large numbers is thousand, million, billion, trillion, etc. (1,000; 1,000,000; 1,000,000,000; 1,000,000,000,000; etc.)
- In American English a thousand million is a billion, but in British English, a thousand million is a milliard.
- When saying large numbers, do not make thousand, million, billion, trillion, etc. plural. (WRONG: *twenty thousands dollars; *five millions people; CORRRECT: twenty thousand dollars; five million people)
- Commas separate thousands, millions, etc. (21,011-31,256,721-941,492,638,526)
- People often say "a" instead of "one" before hundred, thousand, etc. and they often add "and" before the last number (a hundred and twenty-one / a thousand and eleven)
DIFFERENCE BETWEEN BRITISH AND AMERICAN ENGLISH (from Wikipedia)
| Common British vernacular | Common American vernacular | Common British vernacular | |
| "How many marbles do you have?" | "What is your house number?" | "Which bus goes to the high street?" | |
| 101 | "A hundred and one." | "One-oh-one." Here, "oh" is used for the digit zero. | "One-oh-one." |
| 109 | "A hundred and nine." | "One-oh-nine." | "One-oh-nine." |
| 110 | "A hundred and ten." | "One-ten." | "One-one-oh." |
| 117 | "A hundred and seventeen." | "One-seventeen." | "One-one-seven." |
| 120 | "A hundred and twenty." | "One-twenty." | "One-two-oh", "One-two-zero." |
| 152 | "A hundred and fifty-two." | "One-fifty-two." | "One-five-two." |
| 208 | "Two hundred and eight." | "Two-oh-eight." | "Two-oh-eight." |
| 334 | "Three hundred and thirty-four." | "Three-thirty-four." | "Three-three-four." |
ORDINAL NUMBERS AND FRACTIONS
Ordinal numbers are also used for fractions:
- 1/10 - one tenth
- 3/4 - three quarters
- 15/16 - fifteen sixteenths
Some numbers have special names in certain contexts:
0:
- Zero: formal scientific usage
- Naught / nought: mostly British usage
- Aught: Mostly archaic but still occasionally used when a digit in mid-number is 0 (as in "thirty-aught-six", the .30-06 Springfield rifle cartridge and by association guns that fire it)
- Oh: used when spelling numbers (like telephone, bank account, bus line [British: bus route])
- Nil: in general sport scores, British usage ("The score is two–nil.")
- Nothing: in general sport scores, American usage ("The score is two–nothing.")
- Null: used technically to refer to an object or idea related to nothingness. The 0th aleph number (\aleph_0) is pronounced "aleph-null".
- Love: in tennis, badminton, squash and similar sports (origin disputed, often said to come from French l'œuf, "egg"; but the Oxford English Dictionary mentions the phrase for love, meaning nothing is at risk)
- Ace in certain sports and games, as in tennis or golf, indicating success with one stroke, and the face of a die, playing card or domino half with one pip
- Birdie in golf denotes one stroke less than par, and bogey, one stroke more than par
- Couple
- Pair
- Eagle in golf denotes two strokes less than par
- Duo
- Trio
- Half a dozen
- A dozen (first power of the duodecimal base), used mostly in commerce
- A century, also used in cricket scores and in cycling for 100 miles.
- A ton, in Commonwealth English, the speed of 100 mph[5] or 100 km/h.
- A great hundred or long hundred (twelve tens; as opposed to the small hundred, i.e. 100 or ten tens), also called small gross (ten dozens), both archaic
- A gross (a dozen dozens, second power of the duodecimal base), used mostly in commerce
- Googol (1 followed by 100 zeros), used in mathematics; not to be confused with the name of the company Google (which was originally a misspelling of googol)
- 1–0 British English: one-nil; American English: one-nothing, one-zip, or one-zero
- 0–0 British English: nil-nil, or more rarely nil all; American English: zero-zero or nothing-nothing, (occasionally scoreless or no score)
- 2–2 two-two or two all; American English also twos, two to two, even at two, or two up.
- http://www.studyenglishtoday.net/cardinal-numbers.html
- https://en.wikipedia.org/wiki/English_numerals
