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Decomposing Fractions

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DECOMPOSING FRACTIONS LESSON 7.1: ADDITION OF FRACTIONS IN UNIT FORM How many circles do you see? How many equal parts are in the circle? What fraction of the circle ... – PowerPoint PPT presentation

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Title: Decomposing Fractions


1
Decomposing Fractions
  • Lesson 7.1

2
Addition of Fractions in Unit Form
  • How many circles do you see?
  • How many equal parts are in the circle?
  • What fraction of the circle is shaded?
  • 1 half 1 half 2 halves 1 whole. True or
    false?
  • Explain why it is true to your partner.

3
Addition of Fractions in Unit Form
  • How many circles do you see?
  • How many equal parts are in the circle?
  • What fraction of the circle is shaded?
  • 1 fourth 1 fourth 1 fourth 1 fourth 4
    fourths 1 whole. True or false?
  • Explain why it is true to your partner.

4
Application Problem
  • Use your scissors to cut your rectangle on the
    diagonal lines. Prove that you have cut the
    rectangle into 4 fourths. Include a drawing in
    your explanation.

5
Concept Development Problem 1
  • The area of this strip of paper is my whole.
    What number represents this strip of paper?
  • Watch as I fold to decompose the whole into 3
    equal parts.
  • Watch as I draw lines on the creases you made.
  • Draw a number bond to represent the whole
    decomposed into 3 units of?
  • 1 third

6
Concept Development Problem 1
  • Tell me an addition number sentence to describe
    this decomposition starting with 1 equals.
  • Lets show this decomposition in another way.
  • Tell me a new addition sentence that matches the
    new groups starting with 1 equals.

7
Concept Development Problem 1
  • Decompose 5 sixths into 5 units of 1 sixth with a
    number bond.
  • Give me an addition sentence representing this
    decomposition starting with 5 sixths equals.

8
Concept Development Problem 1
  • Lets double the number of units in our whole.
    Fold your strip on the creases. Fold one more
    time in half. Open up your strip. Into how many
    parts have we now decomposed the whole?

9
Concept Development Problem 1
  • On the other side that has no lines, draw lines
    on the creases you made and shade 5 sixths.
  • Show this decomposition in another way.
  • Tell me a new addition sentence that matches this
    new decomposition, starting with 5 sixths
    equals.

10
Concept Development Problem 1
  • Draw a number bond and addition sentence to
    match.
  • Use your paper strip to show your partner the
    units that match each part.

11
Concept Development Problem 2
  • Take a new strip of paper. The area of this
    strip of paper is the whole. Fold this paper to
    create 4 equal parts.
  • Shade all 4 of the parts.
  • Take one more strip of paper, fold it, and shade
    3 of the 4 parts. How much is shaded?
  • The first strip of paper represents
  • On the second strip of paper, we shaded
  • Draw a number bond to represent the 2 parts and
    their sum.

12
Concept Development Problem 2
  • Can be renamed?
  • is equal to 1.
  • Draw a number bond to replace with 1 whole.
  • Write a number sentence that represents this
    number bond.

13
Concept Development Problem 2
  • We say this is one and three-fourths.
  • is another way to record the decomposition
    of
  • as and Compare and contrast
  • One has a whole number. The other has just a
    fraction.
  • They both represent the same area, so they are
    equivalent. When a fraction is greater than 1,
    we can write it using a whole number and a
    fraction.

14
Concept Development Problem 3
  • The rectangle represents 1 whole.
  • Name the unit fraction.
  • Label under both shaded unit fractions.
  • Name the shaded fraction.
  • Decompose into unit fractions.

15
Concept Development Problem 3
  •  

16
Concept Development Problem 3
  • What is the unit fraction?
  • How do you know it is not 1 sixth?
  • This tape diagram shows 5 equal parts shaded as
    being 1. Then, theres another unit after that.
  • This tape diagram represents a number greater
    than 1. This tape diagram is showing a mixed
    number.

 
17
Concept Development Problem 3
  • Tell your partner the number this tape diagram
    represents.

 
18
Concept Development Problem 3
  • Write the number sentence for the tape diagram
    showing a sum equal to 6 fifths.

 
19
Concept Development Problem 4
  •  

 
20
Concept Development Problem 4
  • Draw a tape diagram and a number bond to show

 
21
Practice Problem 1
  • Draw a number bond and write the number sentence
    to match each tape diagram. Talk to your partner
    about what was done for the first problem.

22
Practice Problem 1
  • Draw a number bond and write the number sentence
    to match each tape diagram.

23
Practice Problem 1
  • Draw a number bond and write the number sentence
    to match each tape diagram.

24
Practice Problem 2
  • Draw and label tape diagrams to model each
    decomposition.

25
Practice Problem 2
  •  

26
Exit Ticket
  1. Draw a number bond and write the number sentence
    to match the tape diagram.

27
Exit Ticket
  • Draw and label tape diagrams to model each number
    sentence.
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