Mass and capacity - Add and subtract mass - Presentation

In the educational presentation on mass and capacity, students are introduced to the concepts of adding and subtracting mass in grams and kilograms. The lesson begins with a review, prompting students to recall the number of grams in a kilogram, setting the foundation for the day's learning. The teaching slides guide students through various activities, where they utilise a part-whole model to partition mass into kilograms and grams, calculating them separately. For instance, Malachi's method is showcased, where he adds 2 kg and 300 g to 3 kg and 250 g by breaking down the mass into its components and then combining them to find the total mass.

Further activities encourage students to apply this method to a range of problems, such as adding 3 kg and 450 g to 4 kg and 200 g, and then subtracting mass, like taking 1 kg and 550 g from 8 kg and 600 g. Each problem is designed to reinforce the understanding of mass calculations through hands-on practice. Additionally, real-life scenarios, such as determining the weight of cookies in a jar by subtracting the mass of the empty jar from the total mass, are used to contextualise the mathematical concepts. The presentation concludes with reasoning and independent work sections, where students are challenged to solve problems involving mass using part-whole models, bar models, and their own methods, thereby deepening their comprehension of mass and capacity.