Grammar-Quizzes.com

The program has a step.  (determiner)
The pragram has one step. (cardinal number) 

The ladder has five steps.

The book has two hundred pages.

Bruce worked out for five minutes.

Bruce worked ten days.

 

*It was nine pounds  baby. 
*He lifted a 300 pounds  weight.
*There are twelve millions people in my city.
 

 * It was 9 pound  baby. 
  *It was built ninety nine years ago.

I saw four-foot high cactuses (cacti).
They were 4-feet high.
two four-foot cacti

LARGE NUMBERS

There were 99 children in the study about brand names. (scientific context)

(AP – 172   Spell out numbers below 10; MLA – depends on context)

SMALL NUMBERS

There were ninety-nine children in the study about brand names. (literary context)

(CMOS – 9.3 Spell out whole numbers one through one hundred; MLA – depends on context).)

IN A PAPER LISTING NUBERICAL FINDINGS – STATISTIC OR SCIENTIFIC DATA

There were 10 children in the study about brand names. (scientific context)

IN A PAPER MENTIONING FEW NUMBERS – NONTECHNICAL

Little Women is a story about four girls.  (literature)

AT THE BEGINNING OF THE SENTENCE

* 10 children preferred the Mc Donald's hamburger.
In the group, 10 children preferred the the Mc Donald's hamburger. (word order re-arranged)

Ten children preferred the the Mc Donald's hamburger.

WITH ABBREVIATIONS, DECIMALS & SYMBOLS

Over 90% of the children chose the well-known brand. (scientific context)
The hamburger weighed 4.2 oz. and cost $5.99. (scientific context)

I would estimate that ninety per cent of them were green.  
The quarter-pound hamburger cost six dollars.  (round-off the numbers)

IN DATES

The project began in 2008.

* 2008 marked the beginning of the project.

Two thousand eight marked the beginning of the project. (at the beginning of the sentence)

IN ADDRESSES

She lives at 300 Hillsdale Avenue.

Three hundred ten Hillsdale Avenue is a new retirement community. (when the address is the building's name, or is used at the beginning of the sentence.)

IN RELATED NUMERICAL EXPRESSIONS

*The group consisted of 55 boys and four girls. 
The group consisted of 55 boys and 4 girls. (scientific context)
We have 5 dogs, 11 cats and 1 rabbit. (some numbers are over 10)

The group consisted of fifty-five boys and four girls.  (Express related numbers in the same style within a sentence or paragraph.)
We have two dogs, one cat and one rabbit.  

VERY LARGE NUMBERS

Lucky Hamburgers sold 1.3 billion hamburgers last year. (combine numerals and words)

Lucky Hamburgers sold 1.3 billion hamburgers last year.  (combine numerals and words)

IN THE NAMES OF ORGANIZATIONS AND PRODUCTS

Century 21 Theaters
7-Eleven stores
3M office products
501 jeans    

After Eight candy
One a Day vitamins
Saks Fifth Avenue department store
Six Flags amusement parks

ASSOCIATED PRESS STYLEBOOK (AP)

Spell out numbers below 10, use figures for 10 and above. Spell out a numeral at the beginning of a sentence (unless it identifies a calendar year).  If necessary, rephrase the sentence. (AP – 172)

GREGG

"Spell out numbers 1 to 10; use figures for numbers above 10.... Use figures— even for numbers 1 through 10 (as in this sentence) — when they have technical significance or need to stand out for quick comprehension.…Use the same style to express related numbers above and below 10. If any of the numbers are above 10, put them all in figures. (GREGG – 401-6) 

AMERICAN PSYCHOLOGICAL ASSOCIATION (APA)

"Use numbers to express (a.) numbers 10 and above; (b) numbers in the abstract of a paper or in a graphical display within a paper; (c) numbers that immediately precede a unit of measurement; (d) numbers that represent statistical or mathematical functions, fractional or decimal quantities, percentages, ratios, and percentiles and quartiles.; (e) numbers that represent time, dates, ages, scores and points on a scale, exact sums of money, and numerals as numerals (ex. in approx. expressions); (f) numbers that denote a specific place in a numbered series… (APA – 4.31)

MODERN LANGUAGE ASSOCIATION (MLA)

Recommends using numbers in scientific or statistical papers, but spelled-out numbers when writing about literature or other subjects with infrequent use of numbers.  (MLA – 3.5.2) 

CHICAGO MANUAL OF STYLE (CMOS)

"In general, in nontechnical contexts, spell out whole numbers one through one hundred, round numbers and any number beginning a sentence. For other numbers, numerals are used.  "Consistency must sometimes give way to readability."( CMOS – 9.3)