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:

 A shopkeeper had a drum of 200 liter oil. He sold 125 liter. How much is left?

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:

 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)

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 :

 What is the volume of water remained there in the cylinder after using 5 mL from it?

Follow up
 Ask the students to find the difference of following quantities:
Ask the students to solve the questions given in the textbook