Introduction to fractions: What are fractions?

Introduction to fractions: What are fractions?

Lessons

In this lesson, we will learn:

  • How to understand and write fractions using shape models
  • How to understand and write fractions using groups of objects

Notes:

  • Fractions are parts of a whole!
    • Fractions represent smaller pieces of a total (whole) thing
    • Whole shapes are divided into equal parts
    • Whole groups are divided into equal smaller groups (number of items)

  • If you have nn number of equal parts of a shape, then each part is worth 1n\frac{1}{n} of a whole.
    • Ex. Representing Numbers: Tally Marks 8 equal parts; each part is 18 \frac{1}{8} of a whole

  • When writing a fraction with numbers, there are two parts:
    • The top (the “numerator”) represents how many parts you have
    • The bottom (the “denominator”) represents how many total parts the whole is divided into
    • Ex. Representing Numbers: Tally Marks


  • Fractions can also represent groups of objects.
    • Ex. what fraction of these jellybeans are green?

    • Representing Numbers: Tally Marks

    • If you were to count:
      • all the jellybeans it would be: 1212\frac{12}{12} jellybeans
      • the jellybeans that were NOT green: 12total3green12=912\frac{12 total -3 green}{12} = \frac{9}{12} not green
      • the jellybeans that ARE green and NOT green: 312+912=1212\frac{3}{12} + \frac{9}{12} = \frac{12}{12} jellybeans
      • if you add all the different parts of the whole, you will end up with the whole (when the top is equal to the bottom)
  • Introduction
    Introduction to Fractions:
    a)
    What are fractions?

    b)
    How to write fractions using numbers and shapes

    c)
    How to write fractions to represent groups of objects


  • 1.
    Equal Parts of a Whole
    How many equal parts are there? Each part is how much of a whole?
    a)
    Representing Numbers: Tally Marks

    b)
    Representing Numbers: Tally Marks

    c)
    Representing Numbers: Tally Marks


  • 2.
    Counting Shaded Parts of a Whole
    What fraction is shown by the shaded part(s)?
    a)
    Representing Numbers: Tally Marks

    b)
    Representing Numbers: Tally Marks

    c)
    Representing Numbers: Tally Marks


  • 3.
    Shading in Parts of a Whole
    Represent the fraction by shading in parts of the shape
    a)
    56 \frac{5}{6} of this hexagon: Representing Numbers: Tally Marks

    b)
    47 \frac{4}{7} of this hexptagon: Representing Numbers: Tally Marks

    c)
    13 \frac{1}{3} of this triangle: Representing Numbers: Tally Marks


  • 4.
    Fractions - Word Problem 1
    There were 10 kittens at the pet store. By the end of the day, 3 of them had been adopted.
    a)
    What fraction of kittens were adopted?

    b)
    What fraction of kittens were NOT adopted?


  • 5.
    Fractions - Word Problem 2
    Stella has a butterfly collection at home. She has 5 monarch butterflies, 2 swallowtail butterflies, 8 white cabbage butterflies, and 1 zebra butterfly.
    a)
    What fraction of her collection is swallowtail butterflies?

    b)
    What fraction of her collection is NOT zebra butterflies?

    c)
    What fraction of her collection does the monarch and white cabbage butterflies make up together?


  • 6.
    Guessing the fraction by creating equal parts
    What fraction of the picture is shown by the shaded area? Try to split each into equal parts first.
    a)
    Representing Numbers: Tally Marks

    b)
    Representing Numbers: Tally Marks

    c)
    Representing Numbers: Tally Marks

    d)
    Representing Numbers: Tally Marks