Education Endowment Foundation:1stClass@Number


Edge Hill University
Implementation cost
Evidence strength
Impact (months)
Independent Evaluator
University of Oxford
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An intensive 10-week numeracy intervention delivered by teaching assistants
Pupils: 532 Schools: 130 Grant: £287,500
Key Stage: 1 Duration: 2 year(s) 8 month(s) Type of Trial: Effectiveness Trial
Completed Jul 2018

The EEF tested 1stclass@number, a programme delivered by teaching assistants which provides intensive support for pupils struggling with maths. We funded this project because it has been used by over 4,000 schools and a similar intervention, Numbers Count, has strong evidence of impact.

Our evaluation found that pupils who received 1stclass@number made, on average, two additional months’ progress in maths. This result has a high security rating. However, there was no evidence that this progress translated into an impact on KS1 maths outcomes. This could be because the simple five point scale available for the KS1 measure is less sensitive to change than the headline maths measure used in the trial, or because the KS1 measure tests a broader range of skills than those taught in 1stClass@Number, and so the impact is diluted

The headline finding adds to the growing evidence base supporting the use of teaching assistants to deliver high-quality, structured interventions to pupils who are falling behind. The EEF’s guidance report, Making Best Use of Teaching Assistants provides clear and actionable guidance on how to put this evidence into practice. This finding is promising enough that the EEF and the Every Child Counts team will discuss the potential for further development, testing and scaling up of the intervention.

The intervention was implemented as intended by the developer: most TAs and Link Teachers attended most training sessions, and most of the TAs observed during the evaluation followed the written lesson plans closely.

Project type:Effectiveness Trial
Key stage:Key Stage 1
Delivered by:TAs
Participant group:Individuals
Intervention length:10 Weeks
Cost per pupil:£77
No. of Teachers/​TAs:Variable
Staff training duration:3 Days