A full-time school week is 25 hours of lessons but teachers get 10% PPA so a f/t teacher in Primary would teach no more than 22 hours per week. 0.3 of 22 hours is 6.6 hours of teaching! if you are teaching 8 hours of lessons, you should be on about 0.36. If you are Secondary, a f/t teacher would get additional frees too so you should compare your actual teaching load with that of a f/t teacher to work out your proportion of a f/t contract. Teaching 9 hours will obviosly be a higher contract - I make it 0.4 if you're primary ansd around 0.42 if secondary. You are then required to attend the pro-rata amount of meetings and parents' evenings, but only on the days when you are contracted to work. Working 3 mornings, though, complicates that as you could be at another school in the afternoons. Speak to your Union and get them to confirm my calculations and support you in possibly getting arrears of pay for this year and an increased contract for next year. Schools seem to think that part-timers and supply teachers can be exploited. It's as though they think that our increased free time (unpaid) is grounds for underpaying us for the work that we do.