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There are seven days in a week. Suppose that a baby is 2 weeks and 5 days old. This means that it is 2 lots of 7 days and 5 days old, 19 days altogether.

2
### Example 1

Find the total of 1 week 5 days, 6 days and
3 weeks 4 days. Give the answer
a) in weeksand days,
b) in days.
Solution
a)
wk d
1 5
6
3 4
======
6 1
Method in days column:
5 + 6 + 4 = 15 days
= 2 x 7 days + 1 day
= 2 weeks + 1 day
write down 1 day and carry 2 weeks
answer: 6 weeks and 1 day
b)
6 wk 1 d
= 6 x 7 days + 1 day
= 42 days + 1 day
= 43 days

3
### Example 2

Today is Wednesday. What day of the week will it be in 160 days time?
Change 160 days to weeks and days.
160 d = 160 / 7 wk = 22 wk 6 d
After 22 weeks it will be Wednesday again.
Count a further 6 days on from Wednesday:
Thursday, Friday, Saturday, Sunday, Monday,
Tuesday. It will be Tuesday in 160 days time.
There are 60 seconds in a minute and 60 minutesin an hour.

4
### Example 3

Find the number of seconds in 3 min 49 s.
Number of seconds in 3 min = 3 x 60 s = 180 s
Number of seconds in 3 min 49 s = 180 s + 49 s
= 229 s

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### Example 4

Add the following times together. Give the answers in hours and minutes.
3 h 40 min, 2 h 25 min, 28 min, 1 h 35 min
h min Method in minutes column:
3 40 40 + 25 + 28 + 35 = 128 min
2 25 = 2 x 60 min + 8 min
28 = 2 h 8 min
1 35 write down 8 min and carry 2 h
8 8 answer: 8 h 8 min

o

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