Capital Community College Foundation
Guide to Grammar and Writing: Using Numbers, Writing Lists
A lengthy page of rules regarding how to use numbers in writing, as well as how to write lists. Very helpful.
Grammarly
Grammarly Blog: When Should I Spell Out Numbers?
This page focuses on when to write figures and numbers in writing; it provides the rules for both general writing and for technical, scientific, and complex writing. Examples are provided.
Utah Education Network
Uen: Writing Numerals
This multisensory lesson engages students in reading and writing numbers that are less than 20. Students will learn songs, watch video segments, and engage in tactile exercises related to writing numbers.
Online Writing Lab at Purdue University
Purdue University Owl: Writing Numbers
Straightforward tutorial explaining the rules about numbers in writing.
Get It Write
Get It Write: Using Numbers
Read what style manuals have to say about when to spell out numbers or use numerals. A brief quiz checks your understanding.
Rutgers University
Rutgers University: Guide to Grammar and Style: Numbers
Covers when to write or spell out numbers in writing.
Sophia Learning
Sophia: Writing Numbers: Lesson 2
A slideshow on the formatting rules for using numbers in text. It is 2 of 6 in the series titled "Writing Numbers."
Sophia Learning
Sophia: Writing Numbers
This lesson goes over the formatting rules for using numbers in text.