Meet the Abacus author team

Abacus has been carefully crafted by teachers for teachers to give you freedom when you want it and structure where you choose it. Meet our expert author team below!




Ruth Merttens (Series Editor)

About Ruth

Professor Ruth Merttens is seconded from the University College of St Mark and St John in Plymouth as Education Director of Hamilton Trust, an educational charity producing adaptable resources for primary teachers. Hamilton has recently extended its work to include a numeracy project in secondary schools. Ruth spends most of her time developing these resources but also travels the country giving practical, hands-on in-service training on creative teaching, the teaching of mathematics and English and development in the Early Years. She contributes regularly to professional journals, educational magazines and newspapers. 

Ruth has written a lot of the training materials for the DfES Strategies, including the DfES Planning Guidance in the Primary Strategy and the Foundation materials for Mathematics. More recently Ruth has been one of the advisory group working with DfE on the new primary Maths Curriculum. She has also been asked for advice on the new Early Years Curriculum. Ruth claims that her steepest learning curve was (and is) being the mother of six children!

Jennie Kerwin (Author)

About Jennie

Jennie is an experienced trainer who leads INSET for schools and courses for teachers, as well as the maths component on a primary PGCE course. She has taught in a range of primary schools in the West Midlands, and worked as a Regional Director for the National Numeracy Strategy where she trained consultants.

Jennie now lives with her husband, two sons, dog and numerous chickens in Devon.

Hilda Merttens (Author)

About Hilda

Hilda is a classroom teacher currently working in Year 1 and Year 6. She has also worked supporting secondary school children who are struggling, on a one-to-one basis. Hilda has worked in schools in London, Sheffield, Nottingham, Devon and in India and Australia and has a passion for development of maths throughout the school.

Hilda lived and worked in schools in India for 2 years, training and teachers and teaching children from 3 to 15 years old. Hilda now lives in Exeter with her husband and young children, both who are in the infants at a local state primary school.