Lesson Planning of Addition & Subtraction

 

Lesson Planning of Addition & Subtraction (Units of Time)

Subject Mathematics

Grade 4th

Students` Learning Outcomes

  • Add and subtract units of time without carrying / borrowing.
  • Solve simple real life problems involving conversation, addition or subtraction of units of time.

Information for Teachers

  • Units of time are: minutes and seconds.
  • We can add or subtract only same units.
  • 1 hour = 60 minutes
  • 1 minutes = 60 seconds
  • We multiply the number of hours by 60 to get minutes.

Addition & Subtraction (Units of Time)

  • We multiply the number of minutes by 60 to get sends.

Material / Resources

Writing board, chalk / marker, duster, models of analog and digital clocks [ real if possible], textbook

Introduction

  • Ask the students how long are your lunch break? (Possible answer would be as; 30 minutes)
  • After getting their responses ask them, can you tell this time in seconds? (Possible answer would be as; yes).
  • If yes, then it is equal to how many seconds?
  • Tell them to convert minutes into seconds we multiply minutes by 60.
  • Show them a chart of clock and ask them: as;
  • Look at the clock and ask what the time by now is? (Possible answer would be as; 11:10)
  • What would be the time after 10 minutes and 15 minutes?
  • Today we will study to add or subtract units of time and daily life examples.

Development

 

Activity 1

  • Write the following on the board, as; 7 h, 35 m + 6 h, 21 minutes
  • Ask the students how can we add these hours and minutes?
  • Take their feedback and demonstrate on the board.

       Hours          Minutes

         7                    35

                                               +    6                    21

                                                   13                    56

  • Explain them that we write hours and minutes vertically in the columns.
  • Hours are added to hours and minutes to minutes.
  • Now let us see how we can subtract time? 24 hours 44 minutes 56 sends – 12 hours 21 minutes 34 seconds
  • Ask them to solve the following questions : as; 

               Hours          Minutes    Seconds

      24                      44              56

          12                      21              34

                                      12                      23              22

(1)     8 hours 29 minutes + 4 hours 12 minutes

(2)   19 hours 31 minutes – 10 hours 20 minutes

 

 

Activity 2

  • Give real life examples to further strengthen their concepts.
  • Ask from Rabia. Your mother can cook rice and prepare salad n how much time?
  • Suppose she says that rice in 2 hours 41 minutes and salad in 10 minutes. Can you calculate how much time she took altogether?
  • Help in solving this question: as;
  • Rice took   = 2 hours 41 minutes
  • Salad took =              10 minutes
  • Total time = 2 hours 41 minutes + 10 minutes = 2 hours 51 minutes.
  • State another question as Raza completed his homework in 1 hour 15 minutes and Qasim took 1 hour 15 minutes. How much more time Raza took?
  • Raza took = 2 hours 25 minutes
  • Qasim took = 1 hour 15 minutes
  • Difference between their times = 2 hours 25 minutes – 1 hour 15 minutes = 1 hour and 10 minutes.

            Hour           Minute

               2                25

               –   1                 15

              1                 10

 

 

Sum up / Conclusion
  • Recall the main concepts so students can further improve their deficiencies.
  • 1 hour   = 60 minutes
  • 1 minutes = 60 seconds
  • Hours can be converted to minutes by multiplying with 60.
  • Only hours can be added to hour’s minutes to minutes and seconds to seconds.
  • Assess the students with such sort of questions.
  • Nadeem spends 1 hour 45 minutes to study and 2 hours 13 minutes to play. How much total time does he serves for both activities?
  • Complete the following table.

No

Day

Time beginning

Time ending

Time spent at swimming practice

1

Sunday

3 : 30 pm

5 : 15 pm

1 hour and 45 minutes

2

Monday

5 : 00 pm

6 : 30 pm

 

3

Tuesday

4 : 45 pm

6 : 15 pm

 

4

Wednesday

5 : 40 pm

6 : 45 pm

 

5

Thursday

5 : 25 pm

6 : 45 pm

 

6

Friday

7 : 30 pm

8 : 55 pm

 

7

Saturday

11 : 10 am

2 15 am

 

8

Sunday

1 : 40 pm

3 35 pm

 

9

Monday

4 : 15 pm

5 : 55 pm

 

10

Tuesday

5 : 10 pm

6 : 25 pm

 

11

Wednesday

4 : 45 pm

6 : 10 pm

 

12

Thursday

5 : 25 pm

7 : 40 pm

 

13

Friday

5 : 40 pm

6 : 55 pm

 

14

Saturday

11 : 25 am

1 : 55 am

 

 

Follow up
  • Give some homework questions so students may be able to solve more real life examples.
  • How much time you took for each payer and then add all the five times
  • Calculate your breakfast, lunch and dinner times.
  • Calculate time in which you reach to school from home and reach at home from school.

 

 

 

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