Elapsed time
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. A lesson starts at 6:40 and finishes at 7:15. How many minutes long is it?
2. A lesson starts at 7:45 and finishes at 8:25. How many minutes long is it?
3. A lesson starts at 8:40 and finishes at 9:05. How many minutes long is it?
4. A lesson starts at 4:55 and finishes at 5:25. How many minutes long is it?
5. A lesson starts at 1:35 and finishes at 2:25. How many minutes long is it?
Answer key · Elapsed time
1. 35
From 6:40, count up to 7:00 — that is 20 minutes.
Then on to 7:15 is 15 more minutes.
Elapsed time = 35 minutes.
2. 40
From 7:45, count up to 8:00 — that is 15 minutes.
Then on to 8:25 is 25 more minutes.
Elapsed time = 40 minutes.
3. 25
From 8:40, count up to 9:00 — that is 20 minutes.
Then on to 9:05 is 5 more minutes.
Elapsed time = 25 minutes.
4. 30
From 4:55, count up to 5:00 — that is 5 minutes.
Then on to 5:25 is 25 more minutes.
Elapsed time = 30 minutes.
5. 50
From 1:35, count up to 2:00 — that is 25 minutes.
Then on to 2:25 is 25 more minutes.
Elapsed time = 50 minutes.
Try it together
Choose three objects at home. Estimate their measurements, then check together and explain the differences.