Download this lovely Year 3 Equivalent Lengths mm and cm Reasoning and Problem Solving worksheet to help children reason and solve problems when finding equivalent lengths where the units of measure are millimetres and centimetres. This resource makes use of rulers showing both mm and cm to help children find equivalent lengths. With three sets of questions and a range of contexts used, this activity is perfect for your main class teaching. Included with this resource is an answer page that is laid out clearly making marking a little bit speedier.