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Exercise 18 (Page 1, 2, 3 & 4)-Example 		Home
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1. Add 2 weeks 5 days 20 hours and 3 weeks 6 days 10 hours:

 
weeks
days
hours
 
2
5
20
+
3
6
10
Total
5
11
30
Regroup 5 weeks 11 days 30 hours. (Note: 24 hours = 1 day,          7 days = 1 week)

30 hours = 1 day 6 hours

11 days + 1 day = 12 days

12 days = 1 week 5 days

5 weeks + 1 week = 6 weeks

Answer = 6 weeks 5 days 6 hours

2. Subtract: 3 hours 35 minutes 20 seconds - 1 hour 45 minutes 50 seconds:

(Note: 1 minute = 60 seconds,          1 hour = 60 minutes)

Regroup seconds and minutes.
 
hours
minutes
seconds
 
 
 
60 + 20 = 80
 
3
35 34
20 80
-
1
45
50
Regroup minutes and hours and Subtract.
 
hours
minutes
seconds
 
 
60 + 34 = 94
 
 
3 2
34 94
80
-
   1
    45
50
Answer
   1
    49
30
Answer = 1 hour 49 minutes 30 seconds

3. Multiply: 2 weeks 5 days 25 hours by 6:

2 weeks 5 days 25 hours x 6 = 20 weeks 30 days 150 hours

(Note: 24 hours = 1 day,          7 days = 1 week)

Regroup 20 weeks 30 days 150 hours = 20 weeks 36 days 6 hours = 25 weeks 1 day 6 hours.

Answer = 25 weeks 1 day 6 hours

4. Divide: 27 hours 46 minutes ÷ 3:

Convert 27 hrs 46 min to minutes:

27 hrs 46 min = 1666 minutes

1666 minutes ÷ 3 (quotient is 555 & remainder is 1) = 555 minutes 1/3 minutes

Regroup 555 minutes 1/3 minutes (1/3 minutes = 1/3 x 60 = 20 seconds) = 9 hours 15 minutes 20 seconds

Answer = 9 hours 15 minutes 20 seconds

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