Elapsed Time — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. In Grade 3, a game ended at 5:25 and lasted 40 min, so it started at 4:45.
5:25 minus 25 min is 5:00, minus 15 more gives 4:45.
2. In Grade 3, practice ended at 6:10 and lasted 55 min; it started at 5:15.
6:10 minus 10 is 6:00, minus 45 min equals 5:15.
3. In Grade 3, a movie ended at 8:05 and was 90 min long; it began at 6:35.
8:05 minus 60 min is 7:05, minus 30 min is 6:35.
4. In Grade 3, a party ended at 3:20 after 75 minutes; it started at 2:05.
3:20 minus 1 hour is 2:20, minus 15 min gives 2:05.
5. In Grade 3, a lesson ended at 10:50 and ran 35 min; it started at 10:15.
Same hour: 50 - 35 = 15, so start was 10:15 exactly.
6. In Grade 3, a walk ended at 4:05 after 50 min; it began at 3:15.
4:05 minus 5 is 4:00, minus 45 min equals 3:15.
7. In Grade 3, a concert ended at 7:30 and was 45 min; it started at 6:45.
7:30 minus 30 is 7:00, minus 15 min equals 6:45.
8. In Grade 3, a drill ended at 11:05 AM after 25 min; it started at 10:40.
11:05 minus 5 is 11:00, minus 20 min equals 10:40 AM.
9. In Grade 3, a swim ended at 5:00 after 70 min; it began at 3:50.
5:00 minus 60 min is 4:00, minus 10 min gives 3:50.
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 game: end 5:25, lasted 40 min
→ 4:45
4:45
Grade 3 practice: end 6:10, lasted 55 min
→ 5:15
5:15
Grade 3 lesson: end 10:50, lasted 35 min
→ 10:15
10:15
Grade 3 walk: end 4:05, lasted 50 min
→ 3:15
3:15
Working backward: end time minus duration equals the start time.