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What is the 1st rule for writing numbers?
1. In general spell out the numbers one through ten; write as numerals everything larger than ten. All other rules are exceptions to this basic rule.

What is the 2nd rule for writing numbers?
Always spell out numbers that begin sentences.

What is the 3rd rule for writing numbers?
Use numerals in dates, addresses, percentages and page references.

What is the 4th rule for writing numbers?
Use numerals to express time when a.m. or p.m. is used (use a colon to separate the hour figure from the minute figure.) Don't use the colon and zeros with full hours unless the full hour is in the same text with a partial hour. Spell the hour in full when o'clock is used(e.g., eight o'clock).
 No: Joe will come at eight; Roberta will come at 8:30; and Paul will come at 9.
 Yes: Joe will come at 8:00 p.m., Roberta will come at 8:30 p.m., and Paul will come at 9:00 p.m.
 No: Joe will come at 8:00 p.m., and Paul will come at 9:00 p.m.
 Yes: Joe will come at 8 p.m. and Paul will come at 9 p.m.

What is the 5th rule for writing numbers?
Use numbers consistently for mixed numbers in the same category. If the largest number is more than 10, express all numbers in the group as numerals. Spell out the smaller number when numbers of two categories occur side by side.
 No: The group consisted of one major, three lieutenants, and 26 enlisted personnel.
 Yes: The group consisted of 1 major, 3 lieutenants, and 26 enlisted personnel. [All are military offices.]
 Yes: The 11person delegation visited six European countries. [People and contries are not in the same
 category.]
 No: I printed 100 30page booklets.
 Yes: I printed 100 thirtypage booklets.

What is the 6th rule for writing numbers?
Except in legal documents, write money amounts as numerals. Express even sums of money without the decimal and zeroes, unless the sums are in a group of money amounts that includes both even and uneven figures.
 No: Send the eightythree dollars you owe me.
 Yes: Send the $83 you owe me.
 No: I received checks for $28, $36.42, and $73.50.
 Yes: I received checks for $28.00, $36.42, and $73.50.

What is the 7th rule for writing numbers?
For large numbers, use a combination of words and numerals.
 No: Their net profit for last year was seven point two million dollars.
 Yes: Their net profit for last year was $7.2 million dollars. [Read this out loud as "seven point two million dollars."]

What is the 8th rule for writing numbers?
Use numerals to express decimals and whole numbers with fractions; spell out and hyphenate fractions that stand alone.
 Yes: That time period shows a jump of 1.89 points.
 Yes: Increase the material by 8 2/3 inches.
 No: I took 1/2 of the year for sabbatical leave.
 Yes: I tooke onehalf of the year for sabbatical leave.
 No: I give 1/10 of my income to my church.
 Yes: I give onetenth of my income to my church.

