In the latest Grade 4 update, students continue their journey with our helpful home robot — this time, stepping into the garage to assist Dad with some heavy lifting and sorting. As the robot learns about the weight of different objects and how to compare them, students guide him through a series of practical, real-life challenges that bring the concept of mass to life.

Through this new storyline, students are introduced to mass as a measure of “how much matter” is in an object. They learn to work with grams (g) and kilograms (kg) and discover that 1 kilogram equals 1000 grams — a foundational idea that will carry into more complex measurement topics later on

Students begin by exploring mass in everyday contexts. As the robot helps Dad move and sort items in the garage, students encounter familiar objects — boxes, tools, backpacks — and help determine which ones are heavier or lighter. Along the way, they learn to identify and compare mass, understand the difference between grams and kilograms, and begin writing measurements using the correct symbols, like 500 g or 2 kg.

These early lessons build intuitive understanding and help students visualize mass in numerical form — not just as an abstract unit, but as something that connects to their own experiences.

As the story unfolds, the mathematical challenge grows. With the robot now faced with more detailed tasks — like organizing shelves or weighing parts for a repair — students guide him through converting kilograms to grams (and vice versa), subtracting to find differences in weight, and solving word problems involving total or remaining mass. 

These reinforce the idea that understanding mass isn’t just about memorizing conversions — it’s about using them to solve real, practical problems.

To connect math with real life, students work with weighing scales, both digital and mechanical. They practice:

For Students: The lessons help build a solid understanding of mass, linking abstract units to real-world experiences.

For Teachers: This progression from “heavier vs. lighter” to conversions and problem-solving supports a strong foundation in measurement, preparing students for future work with more advanced data and science contexts.

See It in Action!

Explore the updated Grade 4 mass lessons and see how this engaging storyline helps students build real-life measuring skills.

As always, if you have any questions or need support, feel free to reach out to us at support@happynumbers.com — we’re here to support you and your students every step of the way!