During Unit 5, your children will build the understanding that the size of a fractional part is relative to the size of the whole. For example, 1/2 of the paint in a small bucket could be less paint than 1/3 of the paint in a larger bucket, but 1/3 of a ribbon is longer than 1/5 of the same ribbon because when the ribbon is divided into 3 equal parts, the parts are longer than when the ribbon is divided into 5 equal parts. Your children will use fractions to represent numbers equal to, less than, and greater than one.  They will solve problems that involve comparing fractions by using visual fraction models and strategies based on noticing equal numerators or denominators.  Your children will apply their knowledge of fractions by using rulers to measure to the nearest fourth of an inch.  They will organize their measurement data on a line plot.

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Key Vocabulary

Students need to:

  • Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size.
  • Understand two fractions as equivalent (equal) if they are the same size, or the same point on a number line.
  • Recognize and generate simple equivalent fractions, e.g., ½=2/4, 4/6=2/3).  Explain why the fractions are equivalent, e.g., by using a visual fraction model.
  • Express whole numbers as fractions, and recognize fractions that are equivalent to whole numbers.  Examples: Express 3 in the form 3 = 3/1; recognize that 6/1 = 6; locate 4/4 and 1 at the same point of a number line diagram.
  • Compare two fractions with the same numerator or the same denominator by reasoning about their size.  Recognize that comparisons are valid only when the two fractions refer to the same whole.  Record the results of comparisons with the symbols >,=, or <, and justify the conclusions, e.g., by using a visual fraction model.
  • Generate measurement data by measuring lengths using rulers marked with halves and fourths of an inch.
  • Show the data by making a line plot, where the horizontal scale is marked off inappropriate units- whole numbers, halves, or quarters.  (X’s or dots can be used to plot the data.)