Blog Grammar Rules Is it “Mambo No. 5” or “Mambo No. Five”?

Is it “Mambo No. 5” or “Mambo No. Five”?

Justin Cox

Justin Cox

Administrator at The Writing Cooperative and Eater of Donuts

Published Sep 05, 2018

How to Write Numbers

One, two, three, four, five... Everybody in the car so come on let’s ride.

These are the familiar lyrics to Lou Bega’s version of Mambo No. 5, released in 1999. While the song may be catchy, the title doesn’t fit the grammar rule for writing numbers.

On the surface, writing with numbers is a simple rule: write out numbers between zero and nine. However — as it is with all grammar — as you dig, the layers get complicated.

  1. The Simple Rule
  2. The Exceptions

The Simple Rule

The AP Stylebook refers to numbers as “figures”. Their base rule is to write out figures between zero and nine.

  • I ate four of the 12 donuts for breakfast.
  • She owns two houses.
  • There is zero chance I finish this story.

The Exceptions

There are many exceptions to the AP’s simple rule. The exceptions depend on usage of the figure and the context of the sentence.


Ignore the Simple Rule and use figures when writing addresses. Only spell out the full word when referring to numeric street names nine/ninth and under.

  • She owns 3 Maple Street.
  • I live at 456 Ninth Avenue.
  • He wants to buy the property at 789 18th Street.


When referring to ages, ignore the simple rule and use figures.

  • The 7-year-old boy has a cousin who is 8 years old.

The only exception with ages comes when the figure begins a new sentence.

  • Twenty-somethings are giving 30-somethings a run for their money in this economy.

Beginning a Sentence

Spell out figures that begin a sentence, regardless of the number.

  • Four people ate 4 donuts at the counter.

Common Phrases

Spell out figures when using common phrases.

  • She said to him, “one bird in hand is worth two in the bush” despite not understanding what it meant.


Use figures when writing dates unless referring to centuries nine and under.

  • What comparisons can be drawn between 80s popular culture and that of the first century?


Use numeric figures for decimals, fractions, and percentages greater than one. Write out the figures for anything less than one.

  • We ate two-thirds of the donuts and before running 1.5 miles.


When referring to any denomination of money, ignore the simple rule and use figures.

  • She wrote a check for $2.37. Who does that?

Vessel Names

Ship names ignore the simple rule. Always use numeric figures when referring to the names of ships. The only exception is “Air Force One”.

  • Apollo 1 never left the launch pad and almost ended the space program while Apollo 11 changed the world forever.

While Mambo No. 5 might be a catchy song, its name doesn’t comply with the AP rule regarding figures. Maybe someone will remix the song with the proper title: Mambo No. Five.

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Justin Cox

Justin Cox

Administrator at The Writing Cooperative and Eater of Donuts

Justin Cox is a writer, minister, and donut eater. His words are available online at Wired, Film School Rejects, The Writing Cooperative, The Coffeelicious, and more. Besides writing, Justin is an avid traveler and foodie. He lives in Orlando, Florida with his wife, Carla, and their dog, Mac. Connect with Justin on Twitter, Medium, or at

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"Four people ate 4 donuts at the counter." Why have you opted to not spell out the 4 in your example quoted above?

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