| title | ISBN-13 | year of publication |
|---|---|---|
| Mental Arithmetic: Ans | 978-0-304-29840-2 | 1977 |
| Mental Arithmetic: Bk. 1 | 978-0-304-29836-5 | 1977 |
| Mental Arithmetic: Bk. 2 | 978-0-304-29837-2 | 1977 |
| Mental Arithmetic: Bk. 3 | 978-0-304-29838-9 | 1977 |
| Mental Arithmetic: Bk. 4 | 978-0-304-29839-6 | 1977 |
| Number Skills: Ans | 978-0-304-29770-2 | 1977 |
| Number Skills: Bk. 1 | 978-0-304-29453-4 | 1975 |
| Number Skills: Bk. 2 | 978-0-304-29454-1 | 1975 |
| Number Skills: Bk. 3 | 978-0-304-29455-8 | 1975 |
| Number Skills: Bk. 4 | 978-0-304-29456-5 | 1975 |
| Number Skills: Bk. 5 | 978-0-304-29457-2 | 1975 |
| Number Skills: Bk. 6 | 978-0-304-29458-9 | 1975 |