Embedded Files
Definitions
Definitions
Hour Hand: : Shorter hand that points to the hour (large numbers)
Minute Hand: Longer hand that points to the minutes, or tick marks
Tick Marks: Small lines around the clock that represent minutes
Analog Clock: Standard clock with hands to represent time
Digital Clock: Clock with only numbers to represent time
Number “Time” Line : A line with numbers representing an hour, or more, of time
Interval: The jump on the number line representing a length of time
Start Time: When the time begins in a story problem
End Time: When the time ends in the story problem
Elapsed Time: The time that passes between a start and end time
Elapsed time in 3rd grade
Elapsed time in 3rd grade
Students may be given
the START and END time and need to find the ELAPSED TIME
the START time and the ELAPSED TIME
the END time and the ELAPSED TIME
In third grade, however, students stay within an hour. Students are not asked to go across the timeline into a new hour. They will do that in fourth grade!
Clocks
Clocks
Round and flat clocks
Round and flat clocks
Students have learned for a long time now that they can count around the clock by 5's. They have also known for a long time how to count by 5's on a number line.
Students have learned for a long time now that they can count around the clock by 5's. They have also known for a long time how to count by 5's on a number line.
In 3rd grade, we use both the analog clock and the number line to solve time problems.
In 3rd grade, we use both the analog clock and the number line to solve time problems.
Some students really understand using a clock, while others succeed more using a more linear approach (the number line).
Some students really understand using a clock, while others succeed more using a more linear approach (the number line).
***** Please allow your child to use the model that works best for them and they are most accurate using. *****
Elapsed Time Models
Elapsed Time Models
COunting around the clock
COunting around the clock
One elapsed time model is to use the clock to find the start time, end time, or elapsed time in between.
One elapsed time model is to use the clock to find the start time, end time, or elapsed time in between.
Look for END TIME?
Plot a point on the minute tick mark for the START TIME. Count forward around the clock by ones or fives with the given elapsed time. Where you land is the END TIME you were looking for.
Look for START TIME?
Plot a point on the minute tick mark for the END TIME. Count backward around the clock by ones or fives with the given elapsed time. Where you land is the START TIME you were looking for.
Look for ELAPSED TIME?
Plot a point on the minute tick mark for the START TIME and for the END TIME. Jump around the clock by ones or fives from START to END. Go back and count your intervals by ones or fives to find the ELAPSED TIME.
Using the number Line
Using the number Line
One elapsed time model is to use the number line to find the start time, end time, or elapsed time.
One elapsed time model is to use the number line to find the start time, end time, or elapsed time.
Look for END TIME?
Plot a point on the minute interval line for the START TIME. Count forward on the number line by tens, five, or ones with the given elapsed time. Where you land is the END TIME you were looking for.
Look for START TIME?
Plot a point on the minute interval line for the END TIME. Count backward on the number line by tens, five, or ones with the given elapsed time. Where you land is the START TIME you were looking for.
Look for ELAPSED TIME?
Plot a point on the minute interval line for the START TIME and for the END TIME. Jump on the number line by tens, five, or ones from START to END. Go back and count your intervals jumps to find the ELAPSED TIME.
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