1.7 Geometry and Time

Unit Goals

  • Students reason with shapes and their attributes, partition shapes into equal pieces, and tell time to the hour and half hour.

Section A Goals

  • Build and draw shapes to possess defining attributes.
  • Compose two-dimensional or three-dimensional shapes to create a composite shape.
  • Describe attributes of two-dimensional and three-dimensional shapes.

Section B Goals

  • Partition circles and rectangles into two and four equal pieces and describe the pieces with words (halves and fourths).

Section C Goals

  • Tell and write time in hours and half-hours.
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Glossary Entries

  • a fourth

    One piece of a shape split into 4 pieces that are the same size.

    A  fourth, or a quarter, of the square is shaded.

  • a half

    One piece of a shape split into 2 pieces that are the same size.

    A half of the rectangle is shaded.

  • category
    A label that tells how objects in a group are alike.
  • data
    Information about the things or people in a group.

    Example: If you have a box of colored pencils, then the lengths and colors of each of the pencils are data about the pencils in the box.
  • difference
    The result when one number is subtracted from another.
  • estimate

    To find a value that is close to the correct value.

  • fourths

    The pieces created when a shape is split into 4 pieces that are the same size.

    The circle is split into fourths, or quarters.

  • greater than

    63 is greater than 32.
    63 > 32

  • half-past

    This clock shows half-past 4 o’clock or 4:30.

  • halves

    The pieces created when a shape is split into 2 pieces that are the same size.

    The circle is split into halves.

  • length

    The measure of how long an object is in same-size units with no gaps or overlaps.

    Example: The length of this sneaker is 15 cubes long.

    Shoe. Underneath from toe to heel, 15 connecting cubes all the same size in a tower.
  • less than

    32 is less than 63.
    32 < 63

  • o’clock

    The clock shows 2 o’clock or 2:00.

  • sum
    The total when two or more numbers are added.
  • survey
    A way to collect data using a group of people answering the same question.
  • teen number

    A number with 1 ten and between 1 and 9 ones.

    Example:
    Fifteen is 1 ten and 5 ones.

  • two-digit number