Exercise 5.1 (addition and subtraction of time interval)

Exercise 5.1

a. Write down your school time table for the following:

● Morning school break time to morning school ending time. 11.30 a.m to 12.45 p.m

● Morning school working time. 3 hrs 15 mts

● Afternoon school working time. 2hrs 45mts

● Afternoon Lunch break time. 12.45 p .m. to 1.30 p.m

b. Match the following:

Answer:

9:40 a.m. : 9:40 Hours

3:20 p.m. : 15:20 Hours

6:25 p.m. : 18:25 Hours

11:40 p.m. : 23:40 Hours

6:25 a.m. : 6:25 Hours

3. Addition

a) 4 hours 30 minutes + 2 hours 50 minutes = 7 hours 20 minutes

b) 4 hours 50 minutes + 2 hours 30 minutes = 7 hours 20 minutes

c) 3 hours 45 minutes + 1 hours 35 minutes = 5 hours 20minutes

d) 1 hours 50 minutes + 3 hours 45 minutes = 5 hours 35 minutes

e) 2 hours 25 minutes + 4 hours 50 minutes = 7 hours 15 minutes

4. Subtract

a) 5 hours 10 minutes – 2 hours 35 minutes = ____________

2 hours 35 minutes

b) 4 hours 20 minutes – 2 hours 40 minutes = ____________

1 hours 40 minutes

c) 4 hours 25 minutes – 1 hours 20 minutes = ____________

3 hours 05 minutes

d) 6 hours 55 minutes – 2 hours 20 minutes = ____________

4 hours 35 minutes

e) 5 hours 45 minutes – 3 hours 55 minutes = ____________

1 hours 50 minutes

4. Answer the following:

a. An office works from morning 10 o’clock to afternoon 6 o’clock. What is the working hours of the office in a day?

10 o'clock to noon = 2 hrs

Noon to 6 o'clock = 6 hrs

Total working hours of the office in a day = [6 hrs] + [2 hrs] = 8 hrs

b. A school works from 9 a.m. to 4.10 p.m. What is the working hours of the school?

4.10 pm = 16.10 hrs (4.10+12)

9 am = 9 hrs (−)

The working hours of the school = 7.10 hrs

c. A circus starts at 2:15 p.m. and end after 2:30 hours. At what time the circus ends?

Starting time = 2.15 p.m +

Duration of circus = 2.30 hrs

The circus ends at = [2.15 p.m ] + [2.30 hrs] = 4.45 p.m

d. A bank works from morning 9:30 to evening 4:30. What is the working hours of the bank?

Bank closing time evening 4.30 = 16.30 hrs (−)

The starting of the bank = 9.30 hrs

The working hours of the bank = 7.00 hrs

e. A man comes to his village from abroad. He travels 2 hours 15 minutes in Aeroplane and 4 hours 40 minutes in Car. What is his total time of travel?

Travel in aeroplane    = 2 hrs 15 minutes (+)

Travel in car                 = 4 hrs 40 minutes

Total time of travel      = 6 hrs 55 minutes

f. A painter paints a house for 3 hours 15 minutes in the morning, and 2 hours 50 minutes in the evening. What is his total time of work?

Work in the morning  = 3 hrs 15 minutes  ( + )

Work in the evening    = 2 hrs 50 minutes

                                      = 5 hrs 65 minutes

Total time of work = 6 hrs 05 minutes

Answer:

Exercise: 5.1

3. a) 7 h 20 min b) 7 h 20 min c) 5 h 20 min d) 5 h 35 min e) 7 h 15 min

4. a) 2 hr 35 min b) 1 hr 40 min c) 3 hr 05 min d) 4 hr 35 min e) 1 hr 50 min

5. a) 8 hr b) 7 hr 10 min c) 4.45 hrs d) 6 hrs e) 6 hr 55 min f) 6 hr 05 min

Project / Activity

[24 hours Clock]

Write down the time of travel