Reflection: Developing a Conceptual Understanding Decomposing Submarine Sandwiches - Section 2: Teacher Demonstration


In the past, when teaching students how to model fractions using strips of paper, I would hand out different colors of paper strips, such as red for one whole, blue to represent halves, green for thirds, etc. However, to help student develop a conceptual understanding of fractions and wholes, I wanted students to see that the whole is always the same amount no matter how many times you divide it up.

I also wanted to use a real-world application (Math Practice 4), submarine sandwiches to make sure these strips of paper meant something to the students and for them to see how fractions connect with every day life.

In the past, I would have asked students to fold the strips and draw lines where the folds were. When designing this lesson, I decided that I wanted students to physically cut (decompose) the whole into fractions! 

  Conceptual Understanding
  Developing a Conceptual Understanding: Conceptual Understanding
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Decomposing Submarine Sandwiches

Unit 10: Fractions
Lesson 1 of 16

Objective: SWBAT decompose a whole into a sum of fractions.

Big Idea: Students will decompose paper submarine sandwiches into fraction equations.

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16 teachers like this lesson
Math, Fractions, Measurement and Methods, Partitioning, equal shares, ruler, fraction equivalency, fraction tiles
  100 minutes
student example eighths
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