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Fraction Classroom · 2.3.0 · Student pages

Count elapsed minutes across an hour boundary

Use forward jumps to connect two clock times and explain why an hour changes after sixty minutes.

Anonymous group code: __________   Date: __________

Forward jumps of 25 minutes and 10 minutes connect the start and finish. The longer interval is drawn proportionally longer.9:35 a.m.25 min10:00 a.m.10 min10:10 a.m.
Forward jumps of 25 minutes and 10 minutes connect the start and finish. The longer interval is drawn proportionally longer.

Build the idea

model. A reading session starts at 9:35 a.m. and ends at 10:10 a.m. How long does it last?

  1. Name the start and finish and confirm they are on the same morning. A clock reading is a position in time; elapsed time is the interval between two readings.
  2. Move forward to the next whole hour. There are 60 minutes in an hour, so 60 − 35 = 25 minutes reach 10:00.
  3. Move from 10:00 to 10:10, which adds another 10 minutes. Combine the jumps: 25 + 10 = 35.
  4. Check by starting at 9:35 and adding 35 minutes. Break the interval at 10:00 and confirm that the final reading is 10:10.

Worked example: 35 minutes: 25 minutes from 9:35 to 10:00, then 10 more minutes to 10:10.

Practise and explain

Try p1–p3 with a partner. Use a drawing and label your units. Try e1 independently before comparing responses.

p1. From 11:45 a.m. to 12:20 p.m. on the same day, how many minutes pass?

p2. A session runs from 2:18 p.m. to 2:52 p.m. How many minutes does it last?

p3. A workshop runs from 10:50 a.m. to 11:15 a.m. Find its duration in minutes.

e1. A walk begins at 3:47 p.m. and ends at 4:26 p.m. How many minutes pass? Draw jumps to support your answer.

Transfer the idea

transfer. A task starts at 1:50 p.m. and lasts 25 minutes. What time does it finish, and how can you check?