Year 1 Addition There is no doubt that number lines and bar modelling are now used in many schools to help children understand calculating, especially those who are using a maths mastery approach. We have just added some great new resources using both number lines and bar models to supplement what is already a superb range of material for Year 1. Also, don’t forget to take a look at our interactive resources, many of which include bar modelling, number lines and images to help children understand addition. Go to Year 1: Addition