Find lines of symmetry
Symmetry trains your child to look closely and picture how a shape would fold or flip, which helps when they draw or read a map, and when they notice designs in art, buildings, and nature, like a butterfly's wings. In later grades, the same spatial thinking supports moving shapes by flipping, turning, and sliding them, and eventually the study of when two shapes are exactly the same size and shape.
In this video, your child will learn to find lines of symmetry.
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
How many lines of symmetry does this capital E have?
Example 2
How many lines of symmetry does this rectangle have?
Your child's turn
How many lines of symmetry does this square have?
The three key steps
- 1Fold the shape along a line.
- 2Folds exactly? Line of symmetry!
- 3Try every way you can fold
Mistakes to listen for
- Drawing a rectangle's diagonal as a line of symmetry, because it makes two equal pieces, even though the halves do not match when folded.
- Stopping after one line of symmetry on a shape with several, such as the vertical line on a square.
- Missing a line of symmetry when a shape is tilted on the page, as if it must stand upright.
The lesson shows every step, so your child sees why it works. Read our parent's guide to finding lines of symmetry →
Is your child ready to practice what they've learned?
Bobby's Math Club offers unlimited practice for free.
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More 4th grade Geometry, with questions your child answers along the way.
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 finding lines of symmetry, 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 finding lines of symmetry 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 finding lines of symmetry
Questions at your child's level, about five minutes a day, on finding lines of symmetry and whatever PK-5 skills they need to develop. Unlimited practice, free forever.
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