Clock time and elapsed time differ
Distinguish a clock reading from the time elapsed between start and finish.
Start with the activity ↓If it ends at five, did it take five hours?
Clock time names a moment. Elapsed time describes the interval from start to finish. Count one-hour steps between them.
You start drawing at 3 in the afternoon and finish at 5. The finishing time is five o'clock, but that does not mean five hours of drawing. You also need the start time.
From 3 to 4 is one hour; from 4 to 5 is another. Two hours elapsed. Count the two intervals, not the three labels 3, 4 and 5.
At a whole hour, the long minute hand points to 12 and the short hour hand points to the hour number. Read four and six, then count between them. The hands have different lengths and roles.
If you start and finish immediately at four, zero hours elapsed. A starting clock label of four does not mean four hours already passed. Changing the start while keeping the duration at two hours still means two hours elapsed.
Listen one paragraph at a time
1 / 4
2 / 4
3 / 4
4 / 4
Now check it yourself
Change the start and the number of one-hour steps. Read both clocks and count the intervals between them.
3 → 4 · 4 → 5
Here all times are whole hours in the same morning or afternoon, without passing twelve. Minutes and date changes require later lessons.
Try it away from the screen
Write the numbers 1 through 12 and move a finger between two times. You do not need to wait real hours.
Can you explain another example?
Check your idea 1
Check your idea 2
Can you explain it in a new setting?
Use different examples to explain five o'clock and five hours.
Speak, point or draw on paper. Check whether your own explanation includes these ideas.
Continue reading, or pause here
Next, group and record objects using a chosen rule.