In Year 3 children use their knowledge that there are 10 millimetres in a centimetre and 100 centimetres in a metre to convert measurements between millimetres and centimetres and between centimetres and metres. Part-whole models and bar models are really good ways to illustrate these conversions. We have just added 3 new resources to our collection, all of which are well worth a look if you are teaching measurement in the spring term.