Basic Skills


The Number Rule

Most style guides agree:

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.