Elapsed Time

Bernice Joyce Henry            Edward H. White
3638 Blackstone Av.            1136 W. 122nd. St.
Markham IL 60426               Chicago IL 60643
(708) 331-0878                 (312) 535-5671/2

Objectives:

Student will calculate elapsed time, given beginning and ending time.
Student will state the time using a.m. and/or p.m.

Materials needed:

Model demonstration clock (for teacher use)
U.S. map
Time line
Paper plates (for the third grade class)             
Poster board cards (5" x 5")
Fasteners
Scissors

Strategy:

I.    Teacher will introduce and discuss elapsed time using a typical school
      day after eliciting activities and the exact time they take place from
      the students between the hours of 9:00a.m. and 2:30p.m.

II.   Students will individually construct an analog clock; teacher and
      helpers will assist.

III.  Introduce the problem: Student entered a contest and has won an all
      expense paid trip to participate in M.C. Hammers' Annual Youth Camp
      held in San Antonio, Texas.  However, he/she must check in at the M.C.
      Ranch before noon tomorrow.

IV.   List things to be done before leaving and time intervals.
      Shopping                                 begins:  2:45p.m.               
      Packing                                           7:05p.m.
      Cab ride to bus station                           9:00p.m.
      Luxury charter bus ride from Illinois to Texas   10:15p.m.
      Bus arrival time in San Antonio                   9:35a.m.
      Limousine arrival time at M.C. Ranch       ends: 10:30a.m.

V.    Demonstrate, discuss and teach using the given problem and list of the
      things to be done.  Use the individual time intervals for teacher demon-
      stration and student hands-on activity showing the actual revolutions
      on the clocks.  Elicit correct responses from the students and place
      on the chalkboard.  Upon completion of list, students are to determine
      total elapsed time.  Point out next day arrival.

VI.   Total time and next day arrival time prompts introduction of a.m. and p.m.
      through the use of a time line and the scheduled activities given earlier
      by the students.  Give meanings and relationship to day and night and to 
      the clock.  Class will determine if arrival time is a.m. or p.m. after a
      brief discussion.

VII.  Introduce small group activity:  Each student in the group will select a
      time being sure to indicate whether a.m. or p.m. Helpers will record given
      times on the sheet entitled Hours and Minutes.  Each group will determine
      elapsed time intervals on their worksheets using their clocks and their
      a.m./p.m. cards.  Allow one member from each group to utilize the time line
      as a means of verifying the time and whether it's a.m. or p.m.

VIII. Pass out worksheets entitled "Time" and also "Telling Time to the Minute"
      as a follow-up lesson or practice.