Basic Skills


The Number Rule

Here is a style rule that I call the "Number Rule":

Study the following examples:

Wrong Correct

I have 3 cats.

I have three cats.

There are twenty-five students in my class.

There are 25 students in my class.

My cousin is 5 years old.

My cousin is five years old.

The gunman killed ten people.

The gunman killed 10 people.

I ate 2 pieces of cake.

I ate two pieces of cake.



Like every rule, this rule has exceptions. For example, you may choose to break this rule when writing:


  • 4:00 am
  • 5 o'clock


  • December 3, 2020
  • November 4th


The final score was 3–7.


Instructions for the Quiz

Choose the sentence that is written correctly.