Page 165 - Mathematics_Std_4

Word problems involving measurements of time
Word problems involving measurements of time show how they
are used in real life.

FOR ONLINE READING ONLY
Example 1

Nuru spends 1 hour and 20 minutes to wash dishes. She also
spends 1 hour 35 minutes to water the garden. What is the
total time spent by Nuru on these activities?

Solution

Time for washing dishes = 1 hour 20 minutes
Time for watering the garden = 1 hour 35 minutes

Add the time for the activities as follows:
hours minutes
1 20

+ 1 35

2 55

Therefore, Nuru spends 2 hours 55 minutes to do all activities.

Example 2

A timetable of a certain school starts at 8:45 in the morning and

ends at 4:40 in the evening. What is the daily duration of the
school timetable?

Solution

Convert the time into 24 hours format.
Starting time = 0845
Ending time =1640

Duration = Ending time – Starting time
Subtract the measurements as follows:

158

06/11/2024 17:18:00
MATHEMATICS STD 4 PB 2024.indd 158
MATHEMATICS STD 4 PB 2024.indd 158 06/11/2024 17:18:00