Lesson Plan of Units of Mass/Weight
Subject Mathematics
Grade III
Students` Learning Outcomes
- Measure and write standard units of mass/weight including abbreviation.
Information for Teachers
- Physical balance or spring balance, which is used to measure the mass/weight of different objects, should be error free.
- 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, physical balance, weights (5kg, 2kg, 1kg, 500g, 200g, 100g, 50g), wooden log, stones, medicine bottle, hard ball, bat, ink bottle
Introduction
- Ask following questions to the students;
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- Which unit of mass is used to measure the mass of light objects like a pencil or chalk?(gram)
- Which unit of mass is used to measure the mass of heavy objects like a chair or table? (kilogram)
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Development
Activity 1
- Show the physical balance and weights to the students and tell them how to measure the weight of object.
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- Tell them, place the object in the left hand pan and put the standard weights in right hand pan.
- If the right hand pan is above the left hand pan then put the heavier weight in the right hand pan.
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- If the left hand pan is below the left pan then put the lighter weight in the right pan.
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- When both sides are balanced.
- Then sum of the weights in the right pan is the mass of object (placed in left pan)
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- Ask them to measure the mass/weight of their full school bag by using a balance or physical balance.
- Facilitate students in measuring the weight.
Activity 2
- Place the different objects like wooden log, stones, medicine bottle, hard ball, bat, ink bottle on the table etc.
- Also place the different standard weights like; 50g, 100g, 200g, 500g, 1kg, 2kg, on the table.
- Ask the students to hold the different weights in their hands and feel the weight.
- Then hold the different object one by one in their hands and guess these weights.
- Now show them physical balance.
Sum up / Conclusion
- Sum up the lesson by repeating rules of measurement of weight.
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- Put the object in the left hand pan and put the standard weights on right hand pan.
- When both sides are balanced, sum the standard weights(right pan)
- This sum is a mass of the object (placed in left pan)
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Assessment
- Ask following question to the students;
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- Which is heavier a book or a wooden duster?
- Which unit of weight is used to measure the weight of your school bag?
- Which unit of weight is used to measure the weight of a button?
- Which unit of weight is used to measure the weight of a horse?
- Find the weight of a packet of beans?
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Follow up
- Ask the students to write any 5 household items, their estimated weight and units.
- Now ask two columns on the board as shown:
- Call students in pairs ask them to weight any two objects and write in the columns drawn on the board.
- Weigh all the objects.
- Ask students to read loudly the objects and their weight from the board.
- Assign in pairs the textbook exercise.
- Observe their work.
- Ask the students to solve the questions given in the textbook.
