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.





Key Stage 1

Key stage

EEF Summary

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.

Research Results

Quantitative Reasoning

Months' Progress
Evidence Strength

Quantitative Reasoning (FSM)

Months' Progress


Were the schools in the trial similar to my school?

There were 130 schools in the trial.

107 of the 130 were Good or Outstanding.

The percentage of pupils eligible for pupil premium was 28%.

Could I implement this in my school?

The programme is available to buy from Every Child Counts.

TAs receive six half days of training.

Classroom teachers receive two half days of training.



Delivered by



Participant group


10 Weeks

Intervention length

How much will it cost?

1stClass@Number cost £1,612 per school in the first year, which would be approximately £77 per pupil per year when averaged over three years. This assumes that the intervention would be delivered to two groups of four pupils each year.   

These costs do not include Teacher and TA cover.



Cost per pupil



No. of Teachers/TAs


3 Days

Training time per staff member

Evaluation info





Key Stage

Key Stage 1

Start date

October 2015

End date

July 2018

Type of trial

Effectiveness Trial

Evaluation Conclusions

  1. Pupils who received 1stClass@Number made two months’ additional progress in maths, on average, compared to pupils in the control group. This result has a high security rating. 

  2. The primary result was not statistically significant. This means that, in this trial, even if the intervention had not had an impact, the probability that just by chance we would have observed an effect size as large as the one found is greater than 5%.

  3. Pupils who received 1stClass@Number did not perform better in the end-of-KS1 maths test, on average, than pupils in the control group. This could be because the headline maths measure used in the trial was more sensitive than the simple five point scale available for the end-of-KS1 maths test, or because it tests specifically those skills taught in 1stClass@Number. 

  4. Among pupils eligible for free schools meals, those who received the intervention did not make any additional progress in maths compared to pupils in the control group. This result has lower security than the overall result because of the smaller number of pupils.

  5. 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.

  1. Updated: 29th August, 2019

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