This is the first in a series of worksheet sets on Bar Modelling from the White Rose Maths Hub. This first set contains 3 worksheets. The first introduces students to the bar model diagram and students have to find missing values. All of the questions involve addition and subtraction within 100. The worksheet encourages students to think about the number sentences that are represented by each diagram and also get students to recognise the importance of the proportionality of the different bars. The second worksheet using the bar model to solve word questions. The first few questions ask students to complete the diagrams and in later ones students then have drawn their own. The final worksheet is a series of more challenging questions that should make students think. Many of the problems are multi-step. For each questions students should use a bar model to solve. All sheets are addition and subtraction within 100. This worksheet can be used with students in primary and secondary to get them used to the bar model diagram. All the answers are supplied also. If you have any comments about the sheets please do not hesitate to get in touch with our Hub. It is only with your comments that we can improve what we do.