Mathematical modelling is the process that utilizes mathematics to solve real world problem. As modelling is important in secondary mathematics, the Curriculum Development Section will be introducing mathematical modelling as one of the standard content in the new Malaysian KSSM Mathematics Form 5 Secondary beginning in the year 2021. In this session, the presenter shares how mathematical modelling would be developed using the modelling tasks given to students. What is more interesting is the usage of Classwiz scientific calculator in the modelling task to solve the real world problem. Not only will the learner represent and analyse the real world problem but they will also formula and validate the mathematical model.