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Composite classes in primary school: what parents should know
What a composite class is, why Australian primary schools form them, what the research actually shows, and the questions worth asking your school.
Read the guideKey points
A composite class, also called a multi-age or multi-grade class, brings two or more year levels together with one teacher.
Schools usually form them because enrolments do not divide evenly into whole class groups, and class structures for the following year are commonly settled late in Term 4.
The research is mixed. A large Scottish study found small gains for the youngest children; a United States study found small negative effects that its authors judged not substantively significant.
Across the studies, the quality of the teaching matters more than the way the year levels are grouped.
What is a composite class?
Term 4 is when most families find out how classes will be organised for the following year. Victorian government schools finish on 18 December 2026 and return on 27 January 2027, with students starting the next day [1]; Queensland state schools finish on 11 December 2026 and return on 27 January 2027 [2]. In the weeks before, many parents learn that their child will be in a 3/4 or a 5/6 class, and the first reaction is often concern.
A composite class holds students from two or more year levels in one room with one teacher. The Victorian Department of Education's guidance on class size data gives a plain example: "if there was a composite 2/3 class with 25 students, then the 25 students would be included in the calculation of the average Prep-2, Year 2 and Year 3 class size respectively" [3]. The children remain in their own year level for curriculum and reporting; only the classroom grouping is combined.
They are ordinary rather than exceptional. Writing in 2023, Dr Katherine Bates of the University of Technology Sydney noted New South Wales data showing that one quarter of classes in state schools there had composite groupings in the previous year [4].
Why does the school combine year levels?
The most common reason is arithmetic. Enrolments rarely divide evenly into workable class groups, so combining two year levels is often the only way to avoid one very large class and one very small one. Composite classes are more common in smaller schools and where enrolment numbers are uneven across year levels [4].
Some schools also group deliberately. In New South Wales the curriculum is organised in two-year stages, and some schools structure classes to match, planning from one set of concepts rather than two parallel programs. Tanya Nacar, a teacher of a Year 5 and 6 class at Nerang State School in Queensland, put it this way in a Department of Education article: "It's not about teaching 2 separate curriculums" [5].
What does the research actually say?
The findings are mixed, and the differences are small either way.
The largest recent study comes from Scotland, where researchers linked Scottish Pupil Census records with teacher assessments, using the way the national class-size rules force composite classes as a natural experiment. The Primary 1 analysis covered 190,704 pupil observations across 1,437 schools. They found that "every additional more mature peer raises the probability that a pupil performs at level in numeracy by 0.8 to 1.1 percentage points", with literacy gains of 1.3 to 1.5 percentage points, and no evidence of lower assessments for the older children sharing those classes. They found no significant effects on attendance, suspensions or attitudes to learning, and concluded class size was not driving the results [6].
A United States study points the other way. A RAND working paper drew on Los Angeles Unified School District data for Grades 2 to 5 from 2002 to 2007, about 730,000 records from just over 380,000 students, with multigrade classrooms making up about 3.8 per cent of classrooms. Effects on English were between −0.01 and −0.04 standard deviations and on mathematics between −0.03 and −0.09, which the authors call "not of substantive significance" [7]. The same paper notes Veenman's review of 56 studies, in which the median effect across the 34 with computable effect sizes was essentially zero [7].
Both studies are overseas and both rest on data more than a decade old. No recent Australian study measures achievement in composite classes.
How do other parents feel about it?
The clearest Australian evidence is about attitudes rather than results. A 2006 study in The Australian Educational Researcher surveyed parents at a large co-educational primary school in New South Wales with more than 650 students, where 8 of the 23 classes were composite. The survey drew responses from 190 families covering 284 children [8].
Of parents whose child was placed in a composite class, 86 per cent reported a negative reaction at the start of the year, when they found out which class their child would be in, compared with 14 per cent of parents whose child was in a single-year class. Across the whole sample, 73 per cent of parents ended up comfortable with their child's placement. Along the way, 81 per cent agreed that some children are more suited than others to a composite class, 69 per cent agreed that children in them learn to work more independently, and 71 per cent said they would not change schools over the number of composite classes [8].
This is one school in one year, two decades ago, and it measures opinions rather than learning. Even so, first reactions and settled views often differ.
What does it mean for maths?
Every class, composite or not, contains a wide spread of understanding. A single Year 4 class will include children still securing place value and others ready for formal written methods. Teachers plan for that spread either way; a composite simply puts it in the class name.
For families, the response is the same either way: find out what your child can already do, and keep short, regular practice pitched at that level rather than at the label on the classroom door. Our guide to what the curriculum expects in each year (/learn/is-my-child-on-track) sets out the year-by-year expectations, and our measurement guide for Years 3 to 6 (/learn/measurement-years-3-to-6-how-to-help-at-home) shows how one strand builds across the upper primary years.
What is worth asking the school?
A short conversation a few weeks into the year is usually more productive than a phone call in December. Useful questions: how the class was formed, how mathematics is planned for both year levels, whether children are grouped for some lessons, and how progress will be reported against your child's own year level.
How Noooli can help
Noooli offers short daily maths practice, about ten minutes a day, for Kindergarten to Year 6, aligned to the Australian Curriculum, with free printable maths worksheets (/worksheets/maths) and answer keys and no sign-up. Parents can see their child's progress. Noooli is also on the App Store and Google Play: get the app (/free/app).
References
1. Victorian Government, "School term dates and holidays in Victoria", updated 2 October 2026. https://www.vic.gov.au/school-term-dates-and-holidays-victoria
2. Queensland Department of Education, "Term dates", updated 22 January 2026. https://education.qld.gov.au/about-us/calendar/term-dates
3. Department of Education, Victoria, "About class size data". https://www.education.vic.gov.au/Documents/about/department/aboutclasssizes.pdf
4. Bates, K., "My child is in a composite class. Is this a good thing?", University of Technology Sydney, 21 February 2023. https://www.uts.edu.au/news/2023/02/my-child-composite-class-good-thing
5. Queensland Department of Education, "How composite teaching shapes students and teachers", 16 May 2025. https://qed.qld.gov.au/about-us/news-and-media/stories/composite-teaching
6. Borbely, D., Gehrsitz, M., McIntyre, S., Rossi, G. and Roy, G., "Composite Classes, Class Size and Human Capital Accumulation", Fraser of Allander Institute, University of Strathclyde, 2021. https://fraserofallander.org/wp-content/uploads/2021/03/MPO-Composite-Classes.pdf
7. Mariano, L. T. and Kirby, S. N., "Achievement of Students in Multigrade Classrooms: Evidence from the Los Angeles Unified School District", RAND working paper WR-685-IES, June 2009. https://www.rand.org/content/dam/rand/pubs/working_papers/2009/RAND_WR685.pdf
8. Cornish, L., "Parents' Views of Composite Classes in an Australian Primary School", The Australian Educational Researcher, 33(2), August 2006. https://files.eric.ed.gov/fulltext/EJ766612.pdf
Common questions
Are composite classes bad for learning?
The evidence is mixed and the differences reported are small. A large Scottish study found modest gains for the youngest children, while a United States study found small negative effects that its own authors judged not substantively significant. No recent Australian study measures achievement in composite classes directly.
Why has my child been placed in a composite class?
Usually because enrolments do not divide evenly into whole class groups, so the school combines year levels to keep class sizes workable. Composite classes are more common in smaller schools and where enrolment numbers are uneven across year levels. Some schools also group by stage deliberately.
Can I ask the school to change my child's class?
Class placement processes differ between states and between schools, so ask your school what its process is. A calm conversation about how mathematics and English will be planned for both year levels is usually more useful than a request to move your child.
