Lesson Plan of Units of Mass / Weight

 

Lesson Planning of Conversion of Units of Mass / Weight

Subject Mathematics

Grade 4th

Students` Learning Outcomes

  • Convert kilograms to grams and vice versa.

Information for Teachers

  • Kilogram and gram are the units to measure “weight”. Kilo means thousand that is short for ‘kilogram’.
  • 1 kilogram = 1,000 gram.
  • A paper clip weighs about 1 gram.
  • Kilogram is written as ‘kg’ and grams as ‘g’.
  • A loaf of bread weighs about 700 g.
  • A gram is about a quarter of a teaspoon of sugar, cubic centimeter of water, pen cap or a pinch of salt.

Conversion of Units of Mass / Weight

  • A kilogram is about 7 apples, two loaves of bread or the weight of 1 liter of water.
  • To convert kilograms into grams we multiply, as; g = kg x 1,000
  • To convert grams into kilograms we divide, as; kg = g ÷ 1000

Conversion of Units of Mass / Weight

  • During this lesson the teacher should also consult with textbook at each level wherein and whenever it is required.

Material / Resources

Writing board, chalk/marker, duster, measuring tape, scale, and textbook

Introduction

  • Tell them that today we will study about converting the kg into g.
  • Ask from students what do they know about weight?
  • Ask them that we measure the weight of whom, why and how?
  • Ask from students do they know how much is their weight and they measure the weight with which unit?
  • Tell them that our weight can be measure in kilograms.
  • Ask them, “Have they even seen a balance?”
  • Show them a bathroom scale and measure their weight on it.

Development

 

Activity 1

  • Conversion of kilograms into grams:
  • Select a fat student from the class and weigh him in kilograms in front of the class.
  • Write his weight on the board e.g. 30 kg and tell them, to convert kilograms to grams  we multiply grams with 1000, as;
  • Weight of the student = 30 kg
  • Grams = kilograms x 1000 = 30 x 1000 = 30000 g
  • Conversion of grams into kilograms:
  • Ask a student to give his school bag and weigh it in grams in front of the class.
  • Write on the board its weight in grams e.g. 4000 g and tell the students to convert grams into kilograms we divide grams with 1000.
  • Weight of the bag = 4000 g
  • Kilograms = g ÷ 1000 = 4000 / 1000 = 4 kg.

 

Activity 2

  • Make the following table on the board.
  • Ask the students to estimate the weight of given objects in kilograms and convert into grams as well.

 

Activity 3

  • Explain them if the weight is given in both measures i.e. “kg and g” then first convert kilograms into grams and then add the grams into grams, as;
  • 11 kg, 5 g = (11 x 1000 + 5) g = 11005 g.
  • Give such sort of more examples to the students so they can fully understand the concept.

 

Sum up / Conclusion

  • Finish the lecture by repeating some key points of the lecture.
  • Kilograms and gram are the units to measure “weight”.
  • Kilograms are used to measure heavy weight objects and grams to measure light weight objects.
  • Kilo means thousand and 1 kilogram = 1,000 grams.
  • Kilo-gram is generally written as kg and grams as g.
  • To convert kilograms into grams we multiply.
  • To convert grams into kilograms we divide.
  • If the weight is given in both measure e.g. “kg and g” then first convert kilograms into grams and then add the grams in grams.

Assessment

  • Assess the students by asking them to convert these weights into g: as;
  • i)                    2.6 kg        = ________ g.
  • ii)                  5 kg, 9 g     = ________ g.
  • iii)                21 kg           = ________g.
  • iv)                8 kg, 260 g  = ________ g.

                                     Follow up

  • Assign some questions related to the topic as homework.
  • Ask the students to estimate the weight of following in kilograms and convert in grams also; as;
  • i)                     Dinner set =   ________    kg = __________ g.
  • ii)                   Hen = ________________ kg = __________ g.
  • iii)                 Pillow = __________          kg = __________ g.

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