Unit 2 – Money and measures
Durations of time
Here is part of Letisha’s morning timetable for the day. The scale goes up in 1 _ 4 hour steps.
Start of day
Break time
Reading and writing lesson
9 o’clock a.m.
10 o’clock a.m.
11 o’clock a.m.
1 What is the duration of Letisha’s reading and writing lesson? We can use a number line to help find the difference between the start and end times of the lesson. Count on 1 hour from 1 _ 4 past 9 to 1 _ 4 past 10. Then count on another 1 _ 4 hour until the lesson ends at 1 _ 2 past 10. The duration of the lesson is: 1 hour + 1 _ 4 hour = 1 and 1 _ 4 hours. past 9 Reading and writing lesson 10 o’clock a.m. past 10 + hour +1 hour 1 4 1 4 1 2
Letisha’s lunch break starts at 1 _
2 past 12 and lasts for three-quarters of an hour. When does it end? Count on half an hour (two- quarters) to 1 o’clock.
2
1 2
+ hour
+ hour 1 4
1 2
1 4
past 12
1 p.m.
past 1
p.m.
p.m.
Count on another quarter of an hour to 1 _
4 past 1 p.m.
Letisha’s lunch break ends at 1 _
4 past 1 p.m.
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