Fractions - Subtract 2 Mixed Numbers - Planning

In a comprehensive lesson aimed at Year 5 students, the focus is on mastering the subtraction of two mixed numbers. The lesson begins with a warm-up activity, inviting students to recall previous concepts and set the stage for new learning. The class then delves into the heart of the lesson, utilising bar modelling to visually represent and solve subtraction problems involving mixed numbers. Initially, students tackle problems that do not require exchanging or breaking a whole number. They learn to partition mixed numbers into whole numbers and fractions, converting them to have a common denominator, which simplifies the subtraction process. Through guided activities, students practise this method with various calculations, sharing their solutions and ensuring their bar models accurately reflect the subtraction performed.

The lesson progresses to more complex scenarios where students must grasp the concept of exchanging. This is necessary when the fractional part of the number being subtracted is larger than the fractional part of the starting mixed number. The bar model is again employed to demonstrate how to convert whole numbers into fractions to facilitate subtraction. Students are encouraged to discuss and share other examples where exchanging is essential, reinforcing their understanding of the process. Independent group work and differentiated worksheets offer further practice, with reasoning and problem-solving challenges that solidify their skills. The session wraps up with a reflection on the key skills learned, such as creating equivalent fractions and bar modelling, and a reminder to remember the crucial steps for successful subtraction of mixed numbers.