Sort shapes into families by their sides and angles
Sorting shapes by what they are, not how they look, teaches your child to define things carefully and see how ideas nest inside each other. That matters next year, when area formulas for parallelograms and triangles rely on knowing what a shape is, and in high school geometry, where shapes are identified and proved by their sides and angles.
In this video, your child will learn to sort shapes into families.
The lesson stops at each question for your child's answer.
Three problems, each a little harder
Each problem is worked step by step. Your child will solve the last one before Bobby shows how.
Example 1
What do we call a parallelogram with four right angles?
Example 2
Is a rhombus always a rectangle?
Your child's turn
Which shape is always both a rectangle and a rhombus?
The three key steps
- 1Rectangle: 4 right angles
- 2Rhombus: 4 equal sides
- 3Square: both!
Mistakes to listen for
- Naming shapes by how they are turned, calling a square tipped onto its corner a "diamond" instead of a square.
- Placing each shape in only one group, so a square goes under squares but not under rectangles or rhombuses.
- Mixing up the branches, thinking a rhombus needs right angles or a rectangle needs four equal sides.
The lesson shows every step, so your child sees why it works. Read our parent's guide to sorting four-sided shapes into a family tree →
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Questions parents ask
Does my child need an account to watch?
No. You can watch this on any device at any time. If your child would like to practice sorting four-sided shapes into a family tree, and you'd like parent-friendly reports on your child's progress and growth, you can join Bobby's Math Club for unlimited free practice.
What happens when my child answers a question?
A right answer gets a cheer, and the lesson carries on. If your child isn't sure, they can tap "I don't know yet", and Bobby gives the answer and shows another example. Nothing is scored or stored.
Is this the same lesson that's on YouTube?
Yes. Here, the lesson stops at each question and waits for your child to answer. On YouTube, each question stays on screen for a few seconds, and then the lesson plays on.
Where can I learn more?
There's a short, kid-friendly lesson like this one for every Pre-K to 5th grade math skill, all in our video library. Our parent's guide to sorting four-sided shapes into a family tree has more on where kids get stuck and how you can help at home. In the club, your child practices at just the right level, about five minutes a day, and you get parent-friendly reports as they grow. Learn more about how it works →
Practice sorting four-sided shapes into a family tree
Questions at your child's level, about five minutes a day, on sorting four-sided shapes into a family tree and whatever PK-5 skills they need to develop. Unlimited practice, free forever.
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