Page 162 - SK Year 5 Mathematics DLP

SUBTRACTION OF TIME
Health Poster Project

Hours and minutes Name Time Taken to Complete
3
Raden hour
1 4
5
Siti 1 hours
6
Divani 12 minutes earlier than Siti

Divani Siti
Raden
a Based on the table above, calculate the HEALTHY MEAL
difference in time taken to complete the
project by Raden and Siti.
5 3
1 hours − hour = hours
6 4
5 3 5 × 2 3 × 3
1 hours − hour = 1 hours − hour
6 4 6 × 2 4 × 3
10 9
= 1 hours − hour
12 12
1
= 1 hours
12
5 3 1
1 hours − hour = 1 hours
6 4 12
1
The difference in time taken by Raden and Siti is 1 hours.
12
b How long did Divani take, in hours and minutes, to complete her project?

5
1 hours – 12 minutes = hour minutes
6
5 5 hour minute
1 hours = 1 hour + hour
6 6 4 10
5 10 1 5 0
= 1 hour + ( × 60) minutes
6 – 1 2
1 1 3 8
= 1 hour 50 minutes
5
1 hours – 12 minutes = 1 hour 38 minutes
6
The time taken by Divani to complete her project is 1 hour 38 minutes.

• Emphasise that before subtracting fractions, get the common
154 denominators first.
4.3.1 (i)
• Guide pupils to understand keywords to determine the operations such
as earlier which means subtraction.