During the week, pupils researched the prices of different articles.
For example Year 3 and 4 pupils went to shops to investigate the price of cards and designed some for special occasions, costing the paper and ink.
With the help of parents and teachers, Year 1 made and sold cakes, drinks and ice-creams after school and were asked to find out a fair price for the items.
Children in Year 2 nurtured plants and sold them on a stall after school, and Year 4 children made friendship bracelets and sold them to friends and family. Year 6 won the challenge trophy: they invested their money in equipment for a car-washing business and as a side line made mouse mats.
Many of the groups gave some of their profits to charities, showing that the project was not just about maths and business, but also PSHE and citizenship. Foundation children sent pound;50 to the John Radcliffe Hospital because one of their class was in hospital.
Other years gave money for toys for the playground, to a school in South Africa, for story tapes for the classroom, and games for wet play times.
In all, they made pound;1,095.
Headteacher, Watlington Primary School, Oxfordshire