Numbers with a page of their own

153 numbers, each with a quick reference card: the words in British and American English, the ordinal, the Roman numeral, the place value and the factors. Anything not here goes through the converter. The rules behind every card are in the reference guides, and words to number goes the other way.

Written 28 September 2026.

Spellings and conventions worth knowing

42 of these numbers have something to say beyond their card: a spelling people get wrong, a place where British and American English part company, or a word that changed its meaning.

• 1: One is the only number that takes a singular noun: one page, but two pages. Its ordinal, first, shares no letter with it.
• 2: Two becomes second, which has nothing of two in it: the word comes from the Latin secundus, meaning following.
• 3: Three becomes third, not threeth. The same thir- turns up in thirteen and thirty.
• 4: Four keeps its u. Forty does not, though fourteen does.
• 5: Five becomes fifth, not fiveth. The v turns into an f.
• 7: Seven is the only number from one to ten with two syllables.
• 8: Eight becomes eighth with one t, not eightth.
• 9: Nine loses its e in ninth.
• 11: Eleven and twelve are the only numbers between ten and twenty that do not end in -teen.
• 12: Twelve becomes twelfth, with an f where the v was.
• 13: Thirteen, not thirtheen. The teen numbers from thirteen to nineteen are one word.
• 14: Fourteen keeps the u that forty drops.
• 15: Fifteen follows five into an f, the same way fifth does.
• 17: Seventeen is the longest of the -teen numbers, at nine letters.
• 18: Eighteen has one t, like eighth.
• 19: Nineteen keeps the e that ninth loses.
• 20: Twenty begins the compound numbers, which are hyphenated: twenty-one, twenty-two.
• 21: The first hyphenated number. Every compound from twenty-one to ninety-nine takes one.
• 22: In a compound ordinal only the last word changes: twenty-second, never twentieth-second.
• 30: Thirty, not thirdty. It follows three the way thirteen does.
• 40: Forty has no u, although four and fourteen both keep theirs.
• 44: Forty-four spells the same digit two ways: forty drops the u that four keeps.
• 50: Fifty follows five and fifteen into an f.
• 70: Seventy is the only multiple of ten below a hundred with three syllables.
• 80: Eighty has one t, like eight and eighteen.
• 90: Ninety keeps the e that ninth drops.
• 99: Ninety-nine is the last number written without hundred. From a hundred on, every number below a thousand is built on it.
• 100: One hundred is where British and American English start to differ: 101 is one hundred and one, or one hundred one.
• 101: The first number where British and American English disagree: one hundred and one, or one hundred one.
• 105: Often written one hundred and five in British English and one hundred five in American.
• 200: Two hundred, never two hundreds: after a number, hundred stays singular, as thousand and million do.
• 999: The largest number that fits in three digits, and the last before a scale word is needed.
• 1,000: One thousand, or a thousand. British English puts and only before the last part: one thousand and fifty, but one thousand two hundred.
• 1,001: One thousand and one in British English, one thousand one in American.
• 1,100: Read as one thousand one hundred, or informally as eleven hundred.
• 1,200: Often said as twelve hundred, which is the same number written a different way.
• 1,500: Fifteen hundred and one thousand five hundred are the same number said two ways. This page writes the second, the form that works for every number.
• 2,000: As a year, 2000 is read two thousand, where 1900 was read nineteen hundred.
• 10,000: Ten thousand is where SI style starts grouping digits with a space, 10 000. Numbers of four digits are usually left ungrouped.
• 1,000,000: A million is a thousand thousand, and the first scale word most people write out in full.
• 1,000,000,000: A billion is a thousand million on the short scale used here. On the old British long scale it meant a million million, which is why old books disagree with new ones.
• 1,000,000,000,000: A trillion is a million million on the short scale used here. On the long scale it meant a million million million.

One to a hundred

• 1 one
• 2 two
• 3 three
• 4 four
• 5 five
• 6 six
• 7 seven
• 8 eight
• 9 nine
• 10 ten
• 11 eleven
• 12 twelve
• 13 thirteen
• 14 fourteen
• 15 fifteen
• 16 sixteen
• 17 seventeen
• 18 eighteen
• 19 nineteen
• 20 twenty
• 21 twenty-one
• 22 twenty-two
• 23 twenty-three
• 24 twenty-four
• 25 twenty-five
• 26 twenty-six
• 27 twenty-seven
• 28 twenty-eight
• 29 twenty-nine
• 30 thirty
• 31 thirty-one
• 32 thirty-two
• 33 thirty-three
• 34 thirty-four
• 35 thirty-five
• 36 thirty-six
• 37 thirty-seven
• 38 thirty-eight
• 39 thirty-nine
• 40 forty
• 41 forty-one
• 42 forty-two
• 43 forty-three
• 44 forty-four
• 45 forty-five
• 46 forty-six
• 47 forty-seven
• 48 forty-eight
• 49 forty-nine
• 50 fifty
• 51 fifty-one
• 52 fifty-two
• 53 fifty-three
• 54 fifty-four
• 55 fifty-five
• 56 fifty-six
• 57 fifty-seven
• 58 fifty-eight
• 59 fifty-nine
• 60 sixty
• 61 sixty-one
• 62 sixty-two
• 63 sixty-three
• 64 sixty-four
• 65 sixty-five
• 66 sixty-six
• 67 sixty-seven
• 68 sixty-eight
• 69 sixty-nine
• 70 seventy
• 71 seventy-one
• 72 seventy-two
• 73 seventy-three
• 74 seventy-four
• 75 seventy-five
• 76 seventy-six
• 77 seventy-seven
• 78 seventy-eight
• 79 seventy-nine
• 80 eighty
• 81 eighty-one
• 82 eighty-two
• 83 eighty-three
• 84 eighty-four
• 85 eighty-five
• 86 eighty-six
• 87 eighty-seven
• 88 eighty-eight
• 89 eighty-nine
• 90 ninety
• 91 ninety-one
• 92 ninety-two
• 93 ninety-three
• 94 ninety-four
• 95 ninety-five
• 96 ninety-six
• 97 ninety-seven
• 98 ninety-eight
• 99 ninety-nine
• 100 one hundred

Larger numbers