Page 151 - SK Year 5 Mathematics DLP

Days and hours

1 The sailing time for an expedition from
location A to location E is shown in the Sailing Expedition
diagram. A 5
1 days
8
a Calculate the total sailing time from
location A to location C.
B
5 1
1 days + 1 days = days
8 4 1
1 days
5 1 5 1 × 2 4
1 days + 1 days = 1 days + 1 days C
8 4 8 4 × 2
5 2 1 day 5 hours
= 1 days + 1 days
8 8
7 E
= 2 days D
8
1
5 1 7 1 days
6
1 days + 1 days = 2 days
8 4 8
7
The total sailing time from location A to location C is 2 days.
8

b What is the total sailing time, in days and hours, from
location C to location E?
1
1 day 5 hours + 1 days = days hours
6

1 1
1 days = 1 day + day
6 6
day hour
1 4
= 1 day + ( × 24) hours 1 5
6
1 + 1 4
= 1 day + 4 hours 2 9
= 1 day 4 hours

1
1 day 5 hours + 1 days = 2 days 9 hours
6
The total sailing time from location C to location E
is 2 days 9 hours.

• Adding fractions of days is similar to adding fractions by getting 143
4.3.1 (ii)
the common denominators first before doing addition.