There is currently no limit on the size of most primary and secondary school classes in England although infant classes – for pupils aged four to seven – have a statutory maximum of 30 pupils.
Some exceptions are permitted, such as including a child with special educational needs who is partly educated in a special school as the 31st pupil.
Increasing class sizes "impose greater workload on teachers, which is unreasonable and unacceptable and must be resisted", the NASUWT union say.
According to official Department for Education data, 154 primary schools in Leeds have classes with more than 30 pupils.
In total the schools are home to 333 classes with more than 30 pupils, containing 10,764 children.
These are the Leeds schools with the highest number of classes which contain more than 30 pupils according to the data:
1. Hovingham Primary School
Hovingham Primary School has 13 classes with 31+ pupils in it. This means 407 pupils are in larger classes and taught by one teacher. Photo: google
2. Manor Wood Primary School Formally Carr Manor Primary School
Manor Wood Primary School Formally Carr Manor Primary School has 12 classes with 31+ pupils in it. This means 375 pupils are in larger classes and taught by one teacher. Photo: google
3. St Bartholomew's CofE Voluntary Controlled Primary School
St Bartholomew's CofE Voluntary Controlled Primary School has seven classes with 31+ pupils in it. This means 236 pupils are in larger classes and taught by one teacher. Photo: google
4. Beeston Primary School
Beeston Primary School has six classes with 31+ pupils in it. This means 188 pupils are in larger classes and taught by one teacher. Photo: google
5. Weetwood Primary School
Weetwood Primary School has five classes with 31+ pupils in it. This means 165 pupils are in larger classes and taught by one teacher. Photo: google
6. Alwoodley Primary School
Alwoodley Primary School has five classes with 31+ pupils in it. This means 190 pupils are in larger classes and taught by one teacher. Photo: google