Work with Congruent Parts

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Mathematics, Geometry

Grade 1- 3

Objective

Students will recognize shapes with congruent parts. Students will also count and record the number of congruent parts. Finally, students will divide shapes into a specific number of congruent parts and record the fractions which are formed.

Directions

1.Have each child fold the paper plate in half.
2.Open the paper plate and cut on the folded line.
3.Label one of the pieced 1/2 (as shown below).
4.Take the other piece and fold it in half.
5.Open the piece and cut on the folded line.
6.Label one of the pieced 1/4 (as shown below).
7.Continue the steps above using the unlabeled piece of the plate to make fraction pieces showing 1/8, 1/16, and 2 pieces labeled 1/32.

Guided Practice
  • Have each child hold up 1/4 of his/her paper plate. Ask - How many 1/4 pieces are needed to make a whole paper plate? (4 pieces are needed)
  • Have each child hold up 1/16 of his/her paper plate. Ask - How many 1/16 pieces are needed to make a whole paper plate? (16 pieces are needed)
  • Continue in this manner until the children feel comfortable working with the different fractions.
    Guided and Independent Practice
    Distribute the Congruent Parts activity page and assist students as necessary. Use the other two activity pages, Same Size, Same Shape and Congruent Fractions, to extend this lesson.
  • Resources

    • 1 paper plate for each child
    • scissors
    • pencil or marker for labeling

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