lesson
Measure passing time
1 · Learn
There are 60 seconds in a minute and 60 minutes in an hour. A day has 24 hours. A usual year has 365 days; a leap year has 366.
Months have different lengths. February has 28 days in a usual year and 29 in a leap year. A calendar helps you check a particular month rather than assuming every month has thirty days.
2 · Worked example
From 10:45 to 11:00 is fifteen minutes. From 11:00 to 11:20 is twenty more. The total interval is thirty-five minutes.
3 · Your turn
A journey starts at 14:35 and ends at 15:10. How long is it? How many seconds are in two minutes?
Check your answer
35 minutes; 120 seconds.
4 · Apply your learning
Use a printed calendar to compare month lengths and calculate a short time interval from a timetable.
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