Elapsed Time — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. In Grade 3, class starts at 9:15 and lasts 50 min, so it ends at 10:05.
9:15 plus 45 min is 10:00, plus 5 more equals 10:05.
2. In Grade 3, recess begins at 10:40 and lasts 20 min, ending at 11:00.
10:40 plus 20 minutes lands exactly at 11:00 o'clock.
3. In Grade 3, lunch runs from 12:10 to 12:45, so the duration is 35 min.
Same hour: 45 - 10 = 35 minutes for the lunch period.
4. In Grade 3, the bus leaves at 2:50 and arrives at 3:25, taking 35 min.
2:50 to 3:00 is 10 min, plus 25 min, equals 35 minutes.
5. In Grade 3, art starts at 1:20 and ends at 2:05, lasting 45 minutes.
1:20 to 2:00 is 40 min, plus 5 min, totaling 45 minutes.
6. In Grade 3, reading goes from 11:25 to 12:00, so it is 35 minutes long.
From 11:25 to 12:00 is exactly 35 minutes elapsed time.
7. In Grade 3, gym begins at 2:15 and lasts 40 minutes, ending at 2:55.
2:15 plus 40 minutes equals 2:55 within the 2 o'clock hour.
8. In Grade 3, music from 9:50 to 10:30 has a duration of 40 min.
9:50 to 10:00 is 10 min, plus 30 min, equals 40 minutes.
9. In Grade 3, a field trip starts at 8:45 and lasts 75 min, ending at 10:00.
8:45 plus 15 min is 9:00, plus 60 min equals 10:00.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Grade 3 class: 9:15 start, 50 min
→ 10:05
10:05
Grade 3 recess: 10:40 start, 20 min
→ 11:00
11:00
Grade 3 lunch: 12:10 to 12:45 duration
→ 35 minutes
35 minutes
Grade 3 gym: 2:15 start, 40 min
→ 2:55
2:55
Adding start plus duration yields each end time and range shown.