Lesson Plan of Addition of Units of Mass/Weight
Subject Mathematics
Grade III
Students` Learning Outcomes
 Add measures of mass/weight in same units with and without carrying.
 Solve real life problems involving same units of mass/weight for addition with and without carrying.
Information for Teachers
 In the addition of weights, grams are added into grams and kilograms into kilograms.
 If the addition of grams exceeds 1000 then the number of kilograms so obtained is added into kilograms, e.g. 850g + 175g = 1025g = 1kg + 25g.
 Question should be written vertically under column headings (g and kg).
 Sign of addition “+” should not be written under any column heading.
 While teaching the lesson, the teacher should also consult textbook at all the steps where and when applicable.
Material / Resources
Writing board, chalk/marker, duster, paper strips, rippers of some objects (soap, tooth paste etc.) balance, weights
Introduction
 Show the bath soap and tooth paste to the students and ask;


 What is the weight of tooth paste and bath soap?
 What is the weight of bath soap?
 What is total weight of both things?

Development
Activity 1
 Write the following statement on board.
 Ask one of the students to write the units of weight on board.
 Ask another student to write the weights of basket of apples under the headings of units.
 Now tell them to find the total weight by adding grams into grams and kilograms into kilograms.
 500g + 750g = 1250g = 1kg 250g
 Write 250g below g and carry 1 kg into kilograms column.
 10kg + 12kg = 23kg, write it below kg column.
Activity 2
 Ask students to solve the following sums in their notebooks.
 Tell them firstly add grams into grams.
 Tell them if the numbers of grams exceeds 1000, the number of kilograms so obtained is added into kilograms. 1000g = 1kg
 Observe their work and guide them where necessary.
 Revise the relation between “g” and “kg” by asking from students.
Activity 3
 Ahmed` s weight is 35kg 450g and his sister`s weight is 30kg 780g, what is the total weight of both of them?
 Ask from students:

 What is Ahmad1s weight? (Expected answer; 35kg 450g)
 What is his sister’s weight? (Expected answer; 30kg 780g)
 Which operation can be used to find the total weight? (Expected answer; Addition)

 Ask one student to solve this question on board.
 Since 1250g = 1kg + 250g so total weight = 35kg + 30kg + 1kg + 250g + 666kg 250g.
Sum up / Conclusion
 Conclude that;

 In the addition of weights, “g” is added into “g” and “kg” into “kg”.
 If the grams are 1000 or more than 1000, we carry the kilograms so obtained into the kilograms.

Assessment
 Can we add kg into g?
Follow up
 Visit a nearest shop and ask the shopkeeper about the sale of ghee in Monday, Tuesday and Wednesday. Then find how many kg and g does he sell altogether in three days?
 Ask the students to solve the questions given in the textbook.