這裡所談到的數目寫法，主要用於一般的學術文章寫作。商業和技術文件的寫作有時採用不同的標準。
- 以字來書寫 100 以下的數目，而以阿拉伯數字來書寫 100 以上的數目，惟 100 以上的數目如能以兩個字來表示者例外 -- 你給我記住：twenty-one 和 ninety-nine 等加連字號的數目被視為一個字。
- There are twenty-six students in my wife's third-grade class.
- Michael is over 183 centimeters tall.
- Hartford has over ninety-three thousand citizens.
(有人會辯稱所有這類統計資料應以阿拉伯數字來表示；然而，當它們四捨五入時，用字來表示會比較適當)
- Hartford has 97,500 citizens.
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- Michael is about 183 centimeters tall, which means that he is just over 6 feet tall.
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- 當一個數目後面又接一個數目時，字與阿拉伯數字混合使用。
- My wife teaches 26 third-grade students.
- There were five 4-foot boards on the trucks.
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- Seventy-two inches equals approximately 1.83 meters.
但年份例外：
- 1998 was a very bad year for investors.
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- 日期和年份：December 18, 1997。在書寫日期時，不可使用序數：Her birthday is on April 4th.
- 小數，百分比和分數：235.485, 55%, 14 1/4.
- (比賽的) 得分：The Bulls won the final game by a score of 114 to 106.
- 金額：Tickets cost $35.50 apiece. The city spent $1.1 million for snow removal last year. (或使用 $1,100,000.) 你可以省略千分位的逗點：They spent $7500 on that car before junking it. 再者，地址和郵遞區號也不使用逗點：In 1998, they moved to NE 12887 53rd Avenue.
- 範圍：Lately between 18 and 25 bald eagles have been counted near the Connecticut River.
- 時間：9:15 a.m. (然而，如果你使用 o'clock 這個字，那麼你必須使用字來表示數目：We left at seven o'clock.)
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