Lesson Plan of Subtraction of Units of Volume
Subject Mathematics
Grade III
Students` Learning Outcomes
- Subtract measures of volume in same units with and without carrying.
- Solve real life problems involving same units of volume for subtraction with and without carrying.
Information for Teachers
- Same units of measurement can be subtracted.
- We can subtract liters from liters and mL from Ml.
- Use vocabulary e.g. how many left? How many more?
- While teaching the lesson, the teacher should also consult textbook at all steps where and when applicable.
Material / Resources
Writing board, chalk/marker, duster, pointer/stick, 50mL measuring cylinder, syringe of 5 mL beaker, textbook
Introduction
- Tell a story to students:
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- A shopkeeper had a drum of 200 liter oil. He sold 125 liter. How much is left?
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Development
Activity 1
- Describe a situation:
- If there are 150 mL of water is taken out from a 350 mL bottle. Find how much water is left in the bottle?
- Ask from students and solve above mentioned question on the board:
Activity 2
- Divide the class into two groups.
- Provide each group four 250 mL, one 1000 mL and two 500 mL, empty bottles.
- Ask the students to fill the one liter bottle first using 250 mL empty bottle and then using 500 mL bottle.
- Ask from students:
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- How many 250 mL bottles can be filled with 1000 mL bottle? (Expected answer may be as; 4)
- How many 500 mL bottles can be filled with 1000 mL bottle? (Expected answer may be as; 2)
- How many 250 mL bottle can be filled with 500 mL bottle? (Expected answer may be as; 2)
- If we take out 250 mL from a 500 mL bottle then how much will left? (Expected answer may be as; 250 mL)
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Activity 3
- In a village a water tank of capacity 10,000 liters is constructed. If in a day 200 liter is used then find there are how much water will left with?
Sum up / Conclusion
- Smaller unit of measuring liquid is mL
- Subtraction is used to find the remaining liquid if some of it is used up.
- Only liter from liter and milliliter from milliliter is subtracted.
Assessment
- Ask the students to find the difference between following quantities:
- Provide the students with 50 mL, measuring cylinder, and water in a beaker. Ask them to fill the cylinder with water up to the mark of 50mL. Now, ask them to suck the 5 mL water from the cylinder with the help of an injection syringe.
- Then ask from students :
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- What is the volume of water remained there in the cylinder after using 5 mL from it?
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Follow up
- Ask the students to find the difference of following quantities:
Ask the students to solve the questions given in the textbook
