Mass and capacity - Measure mass - Presentation

In this lesson, students are introduced to the concept of measuring mass using standard units of measurement. They will explore the differences between grams and kilograms, understanding when to use each unit to measure various objects. The lesson prompts students to consider the units we commonly use for mass and to discuss what types of items would be measured in grams versus kilograms. A range of scales will be examined to identify similarities and differences, encouraging students to think critically about the tools used for measuring mass. Additionally, the lesson includes activities where students will estimate and then use balance scales to measure the mass of objects, deciding whether to use gram or kilogram weights to achieve balance.

Following the practical activities, students are encouraged to engage with reasoning tasks that challenge their understanding of mass. They will identify scale divisions and increments to determine the weight of different objects, such as coins, cakes, and beans. Students will also draw scales as straight number lines and calculate missing intervals, further developing their comprehension of measurement. The lesson includes reasoning scenarios where students must decide who has the correct answer regarding the weight of items like mangoes and chocolate bars, requiring them to explain their thought processes. Independent work tasks involve recording the mass of objects in grams or kilograms and determining the weight of items on a number line, solidifying their grasp of the concepts discussed.