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;
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- What is the weight of tooth paste and bath soap?
- What is the weight of bath soap?
- What is total weight of both things?
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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:
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- 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)
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- 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;
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- 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.
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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.
