Decide on the type of math you would like your book to focus on. It is useful to think of a child's age when doing this. Adding and subtracting would be useful for a 6- or 7-year-old, while counting is more appropriate for a 3- or 4-year-old. Speak to teachers at your local schools to learn what type of math is appropriate for your reader.
Create the lessons that you want to feature in your book. A book focused on addition might begin with adding same numbers such as "1 + 1" and "2 + 2." These simple equations may or may not be accompanied by pictures. The book may later go on to focusing on an individual number, such as one plus every number up to nine.
Open a new document in your preferred word processing program, such as Microsoft Word or Wordperfect. Format your pages to the size you would like to use for the book. The simplest format is the standard 8 1/2-inch by 11-inch portrait layout.
Create your pages by adding the lessons you designed to each one. To begin a new page, simply click on the "Insert" tab at the top of your screen and then click on "Page Break." This will take your cursor to the next page.
Print the pages of your book once you have completed them. (Check Print Preview before printing to ensure pages are formatted properly.)
Punch holes in the left-hand side of your pages. Decide if you will use a binder as your book cover or if you will bind your pages together with string or ribbon. Put your pages in a binder in order if you choose to use a binder. Use string or ribbon to tie your pages together if you decide not to use a binder.