Elapsed time problems · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Elapsed time problems

Mathematics · Measurement · ages 8-9
Name ______________________   Date ____________

  1. From 2:15, count 45 minutes to 3:00, then 2 more. How many minutes after 2:15 is that?

    Answer: ______________

  2. A film starts at 2:15 and lasts 47 minutes. When does it end?

    • 2:52
    • 3:02
    • 3:12
    • 2:42

  3. A cartoon starts at 3:00 and lasts 20 minutes. What time does it end?

    • 3:10
    • 3:20
    • 3:40

  4. How many minutes are between 4:00 and 4:15?

    Answer: ______________

  5. From 9:20 to 10:00 is how many minutes?

    Answer: ______________

  6. The number line shows two hops: +10 minutes, then +15 minutes. How many minutes in total?

    051015202530+10+15
    • 35
    • 20
    • 25

  7. How many minutes pass between 9:20 and 10:05?

    • 35 minutes
    • 55 minutes
    • 45 minutes
    • 85 minutes

  8. Jo adds 47 minutes to 2:15 by adding 45 to reach 3:00 then 2 more. She says bridging through the hour helps. Is Jo right?

    Circle one:   True   False

  9. Ben says a movie starting at 7:50 and lasting 30 minutes ends at 7:80. What is his mistake?

    • Minutes only go up to 59, so 7:80 should roll over to 8:20
    • He forgot to include the start time
    • He should have subtracted instead of adding

  10. A lesson runs 1:40 to 2:25. How many minutes long is it?

    Answer: ______________

LightMySky · lightmysky.comW1-mt_IL86kadLSS-s1

Answer key

For grown-ups. Fold this page away before handing over the rest.

Elapsed time problems W1-mt_IL86kadLSS-s1

  1. 47 · 47 minutes because 45 + 2 = 47.
  2. 3:02 · 3:02 is correct because 45 minutes reach 3:00 and 2 more reach 3:02.
  3. 3:20 · Hop forward 20 minutes from 3:00 and you land on 3:20.
  4. 15 · From 4:00 to 4:15 is one hop of 15 minutes.
  5. 40 · 40 minutes because 60 - 20 = 40.
  6. 25 · Add the two hops together: 10 plus 15 is 25 minutes.
  7. 45 minutes · 45 minutes is correct because 40 reach 10:00 and 5 more reach 10:05.
  8. True · Jo is right because bridging splits one hard add into two easy hops that land on 3:02.
  9. Minutes only go up to 59, so 7:80 should roll over to 8:20 · Once minutes pass 60, they roll into the next hour. 50 plus 30 is 80 minutes past 7:00, which is 8:20.
  10. 45 · 45 minutes because 20 reach 2:00 and 25 more give 20 + 25 = 45.
Worksheet · LightMySky