How Long Did It Take? Elapsed Time
A free Grade 4 lesson and worksheet on elapsed time: finding end times and how long events...
View Resource : How Long Did It Take? Elapsed TimeA free Grade 4 math lesson and worksheet on converting units of time: seconds, minutes, hours, days and weeks, using a conversion table, multiplying to change bigger units to smaller units, mixed units such as 2 hours 15 minutes, comparing times and solving schedule problems. Includes a timed lesson plan, worksheet, editable Word version and answer key.
Students learn the relationships between units of time (60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 7 days in a week). They complete conversion tables, multiply to change a larger unit into a smaller one (3 hours = 180 minutes), change mixed units into one unit (2 hours 15 minutes = 135 minutes), divide to go back to larger units, compare lengths of time and solve problems about movies, sleep and school schedules.
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Support: focus on hours and minutes with a table and multiples of 60 listed. Challenge: convert between days, hours and minutes in two steps and work with seconds in long times.
Activities 1 to 4 check conversions and comparisons (answer key included). Activity 5 checks problem solving.
Keep a conversion table on the board. Teach the rule: big unit to small unit, multiply (you need more of the small units); small unit to big unit, divide.
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