Mass and capacity - Add and subtract mass - Worksheet

In the "Add and Subtract Mass" worksheet, children are tasked with the challenge of identifying and calculating the mass of colored boxes and various objects. The lesson requires them to apply their understanding of addition and subtraction to problems involving mass, using both mental and written methods to find the most efficient solution. To aid their learning, they may utilize concrete resources to represent kilograms and grams or employ bar models for visual support in their calculations. The worksheet presents part-whole models for the students to use in adding two masses together, focusing on whole kilograms and increments of 500 grams, as well as other multiples of 10 grams.

The worksheet also includes reasoning and problem-solving exercises to deepen the children's comprehension. For example, they might determine the mass of cookies by subtracting the mass of an empty jar from the total mass of the jar when filled with cookies. Additionally, children use partitioning to break down masses into kilograms and grams before performing calculations, following the method demonstrated by a character named Amir. This approach helps them tackle more complex problems, such as adding and subtracting masses with varying numbers of kilograms and grams. The worksheet provides a practical application of mathematical concepts, encouraging precision and fluency in measuring and manipulating mass.