Lesson plan

Slice it in Half!

Teach your students about symmetry with real life objects! Have them draw lines of symmetry for various shapes, food items, and objects.
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Students will be able to draw lines of symmetry on 2-D shapes, classroom objects, and food items. Students will be able to identify if a shape or object has more than one line of symmetry.

(5 minutes)
  • Explain to students that they will be learning about lines of symmetry today.
  • Ask students if they know what the word symmetry means.
  • Explain that a line of symmetry is the line they get when they divide something and both halves are exactly the same.
  • Model a rectangle on the board, and invite a student to come to the board and draw the lines of symmetry.
(10 minutes)
  • Ask students to name objects around the class that when divided would have the exact same halves.
  • List objects students come up with on the board.
  • Ask students which objects would only have one line versus objects that would have more.
  • When a student describes an object, have them come to the board to draw the object and the lines of symmetry on it.
  • Ask students if lines of symmetry could be drawn on their faces.
(30 minutes)
  • Instruct students to get into groups of 4.
  • List the following 2-D shapes on the board: triangle, square, rectangle, rhombus, kite, pentagon, hexagon, octagon, circle, oval, triangle, and trapezoid.
  • Draw unfamiliar shapes on the board.
  • Direct students to draw and cut the 2-D shapes out of construction paper.
  • Ask students to work with partners within their group to draw the lines of symmetry on the shapes and fold the shapes to see if they are equal halves.
  • Have students save the folded shapes in sandwich bags and put their group number with a permanent marker on the sandwich bag.
  • Set the timer to 20 minutes.
  • Discuss with students which shapes had lines of symmetry and how many. Discuss with students if any shapes had no lines of symmetry.
  • Have each group talk about one shape and its lines of symmetry.
(25 minutes)
  • Instruct students to complete the Symmetry worksheet.
  • Ask your students to complete the Your Half, My Half worksheet.
  • Go over the worksheets as a class.
  • Enrichment: Instruct students to complete the Learning Symmetry Owl worksheet. This worksheet is more challenging because there are more aspects to the image.
  • Support: Ask your students to come to the back of the class. Guide them to draw food items they like on a sheet of paper. Ask if they would like to divide the item with a friend equally. Have them draw a line over the items to see if they can equally share or not. Explain that if they can cut the item into equal pieces, then the item has a line of symmetry. Instruct students to draw more lines of symmetry if possible, and ask if more equal pieces could be created out of that food item.
(20 minutes)
  • Direct your students to complete Sailing the Sea worksheet.
(10 minutes)
  • Have your students take out their sandwich bags from the lesson.
  • Instruct a student to pull out a shape without looking and explain the lines of symmetry in that shape.
  • Ask each group to do the same thing.
  • Repeat this until all shapes have been covered.

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