This workbook will improve and expand on the skills acquired in My Book of SIMPLE SUBTRACTION. In this book, children will practice first how to subtract the numbers 1 through 9 and then they will reinforce this skill by learning how to subtract numbers 1 through 20. The purpose of this book is to prepare children for higher-level mathematics by improving their basic subtraction skills.

Let's Subtract - Mary Hurt and the Sing and Learn Chorus
To the boys and girls who will use this record:
Arithmetic is one of the most important subjects you will ever study. Wherever you may live, whatever you may do, you can be sure that arithmetic has something to do with it. When we learn our addition, subtraction, multiplication and division tables, we are preparing ourselves for not only our studies in higher grades, but for a busy, grown-up life. I have been teaching boys and girls like yourself by the very same method on this record, and this is the way we do it: First we go over our tables completely. Then we listen carefully to them once more, and finally test ourselves. In this manner, we have been able to learn our tables very quickly. I hope you will enjoy studying your tables in this new way. Practice faithfully every day, and you will see how soon it will be before you know them all.
Learning is fun!