Subtraction of Units of Volume

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.

Subtraction of Units of Volume

  • We can subtract liters from liters and mL from Ml.

Subtraction of Units of Volume

  • Use vocabulary e.g. how many left? How many more?

Subtraction of Units of Volume

  • 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?

Subtraction of Units of Volume

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:

Subtraction of Units of Volume

Activity 2

  • Divide the class into two groups.
  • Provide each group four 250 mL, one 1000 mL and two 500 mL, empty bottles.

Subtraction of Units of Volume

  • Ask the students to fill the one liter bottle first using 250 mL empty bottle and then using 500 mL bottle.

Subtraction of Units of Volume

  • 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?

Subtraction of Units of Volume

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:

Subtraction of Units of Volume

  • 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:

Subtraction of Units of Volume

Ask the students to solve the questions given in the textbook

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