Elapsed time problems

Mathematics · Measurement · ages 8-9

Name ______________________ Date ____________

On a number line, hopping forward in time moves you to a later clock time.
Circle one: True False
A cartoon starts at 3:00 and lasts 20 minutes. What time does it end?
- 3:10
- 3:20
- 3:40
How many minutes are between 4:00 and 4:15?
Answer: ______________
How many minutes pass between 8:35 and 9:15?
Answer: ______________
A show starts at 6:40 and lasts 35 minutes. What time does it end?
- 7:05
- 7:15
- 7:25
The number line shows two hops: +10 minutes, then +15 minutes. How many minutes in total?
- 20
- 25
- 35
Recess starts at 10:05 and lasts 55 minutes. It is now 10:47. How many minutes are left until recess ends?
Answer: ______________
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

Answer key

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

True · Hopping forward always lands you later, since time keeps moving ahead.
3:20 · Hop forward 20 minutes from 3:00 and you land on 3:20.
15 · From 4:00 to 4:15 is one hop of 15 minutes.
40 · Hop from 8:35 to 9:00, that is 25 minutes. Then hop 15 more to 9:15. 25 plus 15 is 40.
7:15 · Hop 20 minutes to reach 7:00, then hop the last 15 minutes to reach 7:15.
25 · Add the two hops together: 10 plus 15 is 25 minutes.
13 · Recess ends at 11:00, since 10:05 plus 55 minutes rolls over to 11:00. From 10:47 to 11:00 is 13 minutes.
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.