Elapsed Time (Intro) — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Recess starts at 10:15 and ends at 10:45. How long is recess?
A) 15 minutes
B) 30 minutes
C) 45 minutes
D) 1 hour
10:15 to 10:30 is 15 min, and 10:30 to 10:45 is 15 more min. Total: 30 minutes.
2. A TV show begins at 7:00 and ends at 7:30. How long is the show?
A) 30 minutes
B) 1 hour
C) 15 minutes
D) 45 minutes
7:00 to 7:30 is a single half-hour, which is 30 minutes long.
3. Ari goes to bed at 8:30 and falls asleep at 9:00. How long did it take to fall asleep?
A) 15 minutes
B) 30 minutes
C) 1 hour
D) 45 minutes
8:30 to 9:00 is one half-hour jump, which equals 30 minutes.
4. Math class starts at 9:00 and ends at 10:15. How long is math class?
A) 1 hour
B) 1 hour 15 minutes
C) 1 hour 30 minutes
D) 45 minutes
9:00 to 10:00 is 1 hour, and 10:00 to 10:15 is 15 more minutes. Total: 1 hour 15 minutes.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Lunch runs from 12:00 to 12:30. Lunch lasts 30 minutes.
From 12:00 to 12:30 is one half-hour jump, which is 30 minutes.
2. Music class is from 2:00 to 3:00. It lasts 1 hour.
2:00 to 3:00 is a single whole-hour jump, so class lasts 1 hour.
3. A cartoon runs from 4:15 to 4:30. It is 15 minutes long.
4:15 to 4:30 is a single 15-minute jump, so the cartoon is 15 minutes.
4. Reading time is 7:00 to 7:45 at night. It lasts 45 minutes.
7:00 to 7:15 to 7:30 to 7:45 is 3 jumps of 15 minutes, or 45 minutes.
5. Soccer practice is 5:00 to 6:30. It lasts 1 hour 30 minutes.
5:00 to 6:00 is 1 hour, then 6:00 to 6:30 is 30 minutes more.