L6 Add and Subtract Masses

This engaging Year 3 maths lesson focuses on adding and subtracting masses in grams (g) and kilograms (kg) through practical, hands-on learning rather than worksheets. Pupils explore real-life contexts where mass needs to be combined or reduced, using balance scales, measuring equipment and classroom objects to support their understanding. Children build fluency in working with standard units of mass and develop confidence in calculating with grams and kilograms. They investigate problems such as combining the mass of two objects, finding the difference between items, and solving simple real-world word problems involving mass. Through practical activities, pupils are encouraged to estimate first, measure accurately, and then record and explain their reasoning using appropriate mathematical vocabulary. This supports deeper understanding of when to add or subtract masses and helps children check whether their answers are reasonable. The lesson promotes active, collaborative learning and reduces reliance on worksheets by focusing on hands-on exploration and discussion. Pupils develop both their mathematical reasoning and practical measuring skills, making meaningful connections between classroom learning and everyday life. Designed to support mastery of the Year 3 curriculum, this lesson builds confidence, problem-solving ability and secure understanding of adding and subtracting mass in grams and kilograms.