The phrase "a half of teaching" is not correct in standard English usage.
You might be trying to express a portion or aspect of teaching, but the phrasing is awkward.
Example: "In my opinion, a half of teaching is about understanding the students' needs."
Alternatives: "part of teaching" or "aspect of teaching".
After a half hour of teaching the names of colors, Naima Begum, a kindergarten teacher at Public School 20, saw it was time to start an active, engaging game.
Her book, In Schools We Trust: Creating Communities of Learning in an Era of Testing and Standardization, is a masterpiece sharing the wisdom developed over more than a half century of teaching and school leadership.
It's because, from Napoleon through Stalin and beyond, a century and a half of blood-soaked history taught them that untrammelled national power seldom ends by reaching a salutary balance.
And our political leaders seem now hell-bent on yet more war, as though a decade and a half of such conflicts have taught us nothing; even though the latest reports suggest that the flow of foreign fighters from America and Western Europe into the ranks of ISIS is still intensifying, in spite of all the efforts to stem that flow.
Abuse is becoming a regular and alarming occurrence, with more than half of teaching assistants coming across violent behaviour in the classroom, the playground or at the school gates.
This pilot involved teaching a half of Course 5 to a group of second-year medical students using the resources existing at both sites.
More than half of teaching assistants say they have experienced physical violence in the classroom in the past year, according to a report published by trade union Unison.
After almost a half-century of teaching, at the age of 81, Mr. K. had died of Parkinson's disease.
The usual stipend is room and board plus half of a teaching fifth for resident tutors or freshman proctors, and free meals for non-resident tutors.
