| 1960s teaching focus |
| Parent-puzzling arithmetic |
| Education fad of the 1960s |
| 1960s educational doctrine |
| 1960s educational experiment |
| School subject since the 1950's |
| '60s elementary-school innovation |
| Teaching method based on set theory |
| Educational innovation of the 1960's |
| Teaching approach based on set theory |
| Number theory and abstract algebra, e.g. |
| Set of teaching practices introduced in the 1960s |
| Failed school curriculum that was the subject of the 1973 book "Why Johnny Can't Add |