Working Out Elapsed TimeHow long something took — counted in friendly jumps, not by…3rd GradeDo not subtract 2:45 from 4:20 in a column. Jump along a time line instead.1START AT THE FIRST TIMEWrite it at the left of a blank line.2JUMP TO THE NEXT WHOLE HOURFrom 2:45, jump 15 minutes to 3:00.3JUMP WHOLE HOURS3:00 to 4:00 is one hour.4JUMP THE LAST MINUTES4:00 to 4:20 is 20 minutes.5ADD THE JUMPS15 min + 1 hr + 20 min = 1 hour 35 minutes.Time is base 60, not base 10. That is exactly why column subtractiongoes wrong.Working Out Elapsed Timewww.littleactivity.com

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Math · 3rd Grade

Working Out Elapsed Time

How long something took — counted in friendly jumps, not by subtracting.

How to use it

Use a number line of time. Subtracting clock times causes more errors than anything else.

Free · print-ready PDF · US Letter and A4

Grade
3rd Grade
Ages
8–9
Subject
Math
Pages
1

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