The other day, I was hanging out with Criss Angel and David Blaine, walking across pools and through plate glass windows, all that typical stuff. While Criss set himself on fire and David hung from a crane in a block of ice, I wowed the crowd with this amazing trick where I make useless words disappear right in front of their eyes: no hands, no props, just a WordRake button. Pure magic. The crowd burst into applause, stunned.
When we hosed off Criss and thawed out David, they showed me another amazing trick, all based on nothing but numbers. I’m going to teach it to you: First, arrange a deck of cards in suits, each suit in order, deuce through ace. Stack the suits, alternating red and black (it’s prettier). Cut the deck thirteen times. Now, watch closely as I distract you by talking about something else: numbers.
Have you ever noticed how numbers govern our lives? From the 1s and 0s in our computers to the tide tables to the syncopation of jazz to the sunrise to the Golden Ratio to our monetary system? Everywhere we look are numbers, bringing order to the chaos, and it is good (mostly); the problem arises when we have to write those numbers. Whether we speak, “Nine” or “9,” no one knows the difference. But on paper we have to choose: words or numerals. Which do we use? Like all things profound, it depends.
Numbers are so precise, so predictable, we can hit the moon with a rocket in any language (as long as we remember to convert inches to millimeters); but English Language authorities cannot agree on how to write those numbers. The Chicago Manual of Style disagrees with the MLA Handbook, which contradicts the Publication Manual of the American Psychological Association, which never considers what college professors teach journalism students. The Chicago Manual of Style notes, “As soon as one thinks one has arrived at a simple rule for handling some category of numbers, exceptions begin to appear, and one realizes that the rule has to be made more complicated.” But we can follow a few conventions to bring sanity to our writing lives.
The Central Question: Should we spell a number or use the numeral? There are two answers, of course, one contradicting the other: Many texts suggest we spell only numbers from one through nine (and their multiples): so three and seven thousand, but 23; others suggest spelling numbers from one through ninety-nine (and their multiples): so fifty-six and thirty-nine million, but 102 and 5,329. I prefer the second method, but either is fine; just be consistent.
With that as our foundation, here are thirteen (or 13) exceptions; there are more, but unless you are a publisher, these will suffice. Note that most of the time, we use the numeral:
Use Numerals with:
Number Combinations: When you compare numbers, be consistent; if some should be words and others should be numerals, make them all numerals: In one year, Criss Angel walked through 108 concrete walls, 73 plate glass windows, and 2 iron gates.
Large Rounded Numbers: about 8 billion.
A Year: 47 B.C. (or B.C.E.).
Number Clusters: The ages of the six conscripts were 7, 9, 10, 12, 13, and 15.
Percentages and Decimals: 5 percent, .62 miles.
Units of Measurement in technical writing: 3 pounds, 17 hectares.
Abbreviated Measurements in all writing: 5 mi, 55 mph.
Whole Numbers with Fractions: 8½-by-11-inch paper.
Page Numbers: page 4.
Use Words with:
Units of Measurement in nontechnical writing: The last time David Blaine stabbed himself, he lost three pints of blood.
Round Numbers and Approximations: about two thousand years ago.
Use Both with:
Numbers Modifying Numbers: 4 sevens, or three 10s.
“Ordinal” Numbers (numbers that express order): same rules as for “cardinal” numbers: first, second, twenty-third (or 23rd), but 137th.
Back on the street. After I cut the deck thirteen (or 13) times, I distracted you by talking about numbers, while I dealt thirteen hands. Now, I flip over each hand, and voilà, I have four-of-a-kind every time! Amazing! How does he do that? Ask David and Criss, and they will tell you: Nothing up our sleeves but numbers. See you in the streets again next week for more on numbers.