A time interval is how much time passes between a start and an end. To find it, count on from the start time. First jump to the next o'clock, then count the rest.
From 9:35 to 10:20: 9:35 to 10:00 is 25 minutes, and 10:00 to 10:20 is 20 minutes. Altogether that is 45 minutes. To find an end time, add the minutes on to the start time the same way.
Worked example
A film starts at 2:15 and lasts 50 minutes. What time does it end?
- 2:15 to 3:00 is 45 minutes.
- 50 − 45 = 5 more minutes, so 3:05.
Answer:3:05
Key words
- interval
- the time between two times
- start time
- when something begins
- end time
- when something finishes
Practise this
New questions every time.
Common Core-referenced: 3.MD.A.1