Chapters
Exercise 1
Convert the following units into sexagesimal form:
12,413 seconds.
7,950 seconds.
2.32 hours.
Exercise 2
Convert the following units into decimal form.
3h 26 min 53 s.
2 h 48min 30 s.
3 h 36 min 42 s.
Exercise 3
Calculate:
6 h 13 min 24 s − 2 h 24 nin 36 s.
Exercise 4
Calculate:
5 h 48min 50 s + 6 h 45 min 30 s + 7 h 58 min 13 s
6 h 13 min 45 s + 7 h 12 min 43 s + 6 h 33 min 50 s
Exercise 5
Calculate:
(15 h 13 min 42 s) × 7.
Solution of exercise 1
Convert the following units into sexagesimal form:
12,413 seconds
The quotient 206 will be further divided by 60 to get hours or degree like this:
12413 s = 3h 26 min 53 sec
7,950 seconds
The quotient 206 will be further divided by 60 to get hours or degree like this:
7950 s = 2h 12 min 30 sec
2.32 hours
0.32 x 60 = 19.2 min
0.2 x 60 = 12 = 12 sec
2h 19 min 12 s
Solution of exercise 2
Convert the following units into decimal form.
3h 26 min 53 s
3h = 3 x 3600 s = 10, 800 s
26 min = 26 x 60 s = 1560 s
53 s = 53 s
3h 26 min 53 s = 12413 s
2h 48 min 30 s
48 min = 48 x 60 s = 2880 s
30 s = 30 s
2h 48 min 30 s = 10110 s
3h 36 min 42 s
36 min = 36 x 60 s = 2160 s
42 s = 42 s
3h 36 min 42 s = 13,002 s
Solution of exercise 3
Calculate:
6 h 13 min 24 s − 2 h 24 nin 36 s.
Add 60 seconds section of the first number and subtract 1 from the minutes part like this:
Repeat the same process for minutes:
Solution of exercise 4
Calculate:
15 h 48min 50 s + 6 h 45 min 30 s + 7 h 58 min 13 s.
Divide 93 by 60:
The remainder reflects seconds and add the quotient to minutes to make it 152 and divide it by 60 like this:
Add the quotient 2 to hours to get 18 + 2 = 20 h and the remainder is minutes. The final answer is:
20 h 32 min 33 sec
6 h 13 min 45 s + 7 h 12 min 43 s + 6 h 33 min 50 s
Divide 138 by 60:
Add the quotient 2 to minutes to make is 58 + 2 = 60 and divide it by 60 like this:
Add the quotient 1 to hours to make it 19h + 1 = 20 h. the final answer will be:
20h 18 s
Solution of exercise 5
Calculate:
(15 h 13 min 42 s) × 7
(15 h 13 min 42 s) × 7 = 105h 91 min 294 s
Divide 294 by 60:
The number in the remainder is the seconds and add the quotient 4 to minutes to make is 91 + 4 = 95 and divide it by 60 like this:
The remainder 35 is minutes and add the quotient 1 to hours. The final answer is:
106 h 35 min 54 sec
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