Page 168 - Mathematics_Std_4

Activity 1 Learning time measurements
through reliable online resources

Description
Explore various examples using reliable programs such as
FOR ONLINE READING ONLY
Khan Academy to learn more about converting measurements
of time and solving word problems related to the concept of time.

Summary
1. Time is written in either the 12 hours or 24 hours format.
2. If the total number of minutes after adding exceeds 60,

convert the minutes into hours and minutes.
3. If the minutes to be subtracted are insufficient, take 1 hour
from the hours and convert it into minutes. Add the minutes

and then subtract the required minutes.

Revision Exercise

1. Convert the following time measurements:
(a) 7 days to hours (b) 168 hours to days

(c) 12 years to months (d) 1 week to minutes

2. A chicken hatches a chick after incubating eggs for 21
days. What is this duration in hours?

3. hours minutes 4. hours minutes 5. hours minutes
7 35 4 45 9 25

+ 4 20 + 3 45 − 3 45

6. hours minutes 7. hours minutes 8. hours minutes
6 50 8 55 5 35
+ 2 35 − 2 35 − 1 22

161

06/11/2024 17:18:01
MATHEMATICS STD 4 PB 2024.indd 161
MATHEMATICS STD 4 PB 2024.indd 161 06/11/2024 17:18:01