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### Post-Office Numbers

3-5

A post office is a good example of a real-world environment in which numbers of different types can be found. Whole numbers and fractions are introduced. Numbers that occur in a greater variety of measurement situations can also be introduced. At this level, students should be encouraged to elaborate on the way numbers are used.### Sports Numbers

3-5

Students are familiar with sports and sporting events. Whole numbers
and fractions are used to represent the size of groups or collections
and measurements involving lengths, weights, and times in many sporting
and game situations. This knowledge can be used to give the students
another picture of numbers.### Parts of a Square

3-5

Students investigate the ways shapes can be divided into equal pieces
with one or two cuts. The lesson provides a review of the following vocabulary
terms:
square, triangle, and rectangle; congruent, one-half, and one-fourth.
The other lessons in this unit build on this introductory lesson.### Describing Designs

3-5

Students create designs and describe them to a classmate, using fractional and geometric terms. This lesson provides a context for using the following vocabulary terms: horizontal, vertical, square, rectangle, triangle, diagonal, one-half, and one-fourth.### Eggsactly with a Dozen Eggs

3-5

Students begin to examine fractions as part of a set. This lesson helps students develop skill in problem solving and reasoning as they examine relationships among the fractions used to describe part of a set of 12.### Eggsactly with Eighteen Eggs

3-5

Students continue to examine fractions as part of a set. This lesson helps students develop skill in problem solving and reasoning as they examine relationships among the fractions used to describe part of a set of eighteen.### Eggsactly Equivalent

3-5

Students use twelve eggs to identify equivalent fractions. Construction paper cutouts are used as a physical model to represent various fractions of the set of eggs, for example, 1/12, 1/6, and 1/3. Students investigate relationships among fractions that are equivalent.### Another Look at the Set Model using Attribute Pieces

3-5

The previous lessons focused on the set model where all objects in the
set are the same size and shape. Students also need work with sets in
which the objects “look” different. In the real world, we are often
faced with fraction situations where the objects in the set are not
identical. For this lesson, students use fractions to describe a set of
attribute pieces. Students develop skill in problem solving and
reasoning as they think about their set and how to create new sets
given specific fractional characteristics.### Class Attributes

3-5

During this lesson, students create their own classroom survey or use previously generated questions to study the class and describe the set [class] in fractional parts. This lesson requires that students identify fractions in real-world contexts from a set of items that are not identical. This lesson is integrated with other areas of the math curriculum, including data analysis and statistics.### Another Look at Fractions of a Set

3-5

This lesson gives students another opportunity to explore fractions using the set model. This lesson is integrated with other areas of the math curriculum including data analysis and statistics.