First Class at Number is delivered by trained teaching assistants to small groups of children who have fallen behind at mathematics. Teaching assistants work from detailed lesson plans, adapting them according to information gained from structured assessments. They help children to think and talk about their mathematics. First Class at Number has a Post Office theme: children use letters, parcels, postcards and house numbers to support their mathematics and write postcards to tell their class teachers about their achievements. Teaching assistants are supported by a link teacher, who may be the Numbers Count teacher or another teacher chosen by the school. The resources for the lessons are all provided in a sturdy box and the school will only need to find a few items of mathematics equipment such as some cubes and coins.