Lesson Plan of Subtraction

Lesson Plan of Subtraction

Subject Mathematics

Grade III

Students` Learning Outcomes

  • Subtract numbers up to 4-digits (without borrowing) vertically and horizontally.

Information for Teachers

  • To subtract 4-digit numbers, subtract ones (O) from ones, tens (T) from tens, hundreds (H) from hundreds and thousands (Th) from thousands.

Subtraction

  • In vertical method of subtraction, first of all we arrange the numbers in columns according to he place value and then subtract the digits in the same order.
  • In horizontal method of subtraction, first of all we arrange the numbers in rows according to the place value and then subtract the digits in the same order.
  • While teaching the lesson, also consult textbook where and when applicable.

Material / Resources

Writing board, chalk/marker, duster, chart (having subtraction question of horizontal method), Mathematics textbook

Introduction

  • Ask the following questions to the students:
      • Up to how many digits you can subtract numbers?
      • From where do we start subtracting the numbers, right or left?
  • Collect their response and write some subtraction questions of 2-digit and 3-digit numbers (without borrowing) on the board.
  • Call the students one by one to solve the questions on the board.
  • Involve the remaining students to check the answers. Correct the mistakes if any.
  • Write the following question on the board:

Subtraction

  • Ask the students. How will you subtract these 4-digit numbers?
  • After their response, conclude that the procedure of subtraction of 2-digfit and 3-digit numbers isplicable to the subtraction of 4-digit numbers.
  • Call any student to solve the question on the board, check the answer and correct the mistakes if any.
  • Tell the students that this method of subtraction is called Vertical Method of Subtraction.
  • Ask the students to recall the vertical and horizontal methods which they have learnt in addition. In subtraction we use the same methods.
  • Let us practice vertical and horizontal methods of subtraction (without borrowing).

Development

Activity 1

  • Write the following question on the board: subtract 1653 from 2876 vertically.
  • Ask the students. What will we do first to solve this question?
  • After their response, tell the students that first of all we arrange the numbers in columns according to the place value and then subtract the digits in the same order.
  • Solve the question on the board with the help of the students.
  • Conclude the result that when we subtract the numbers in columns. This method of subtraction is called Vertical Method of Subtraction.

Activity 2

  • Write the following question on the board:
    • Subtract vertically:
      • 2461 from 5473
      • 5283 from 8396
  • Call any two students to solve the questions on the board.
  • Ask the remaining students to check their work and point out the mistakes if any. Encourage the students for their active participation.

Activity 3

  • Display the following chart in front of the class:

Subtraction

  • Read the question and demonstrate the horizontal method of subtraction with the help of this chart.
  • Tell the students that subtract ones (O) from ones, tens (T) from tens and hundreds (H) from hundreds.
  • Ask the students to solve the following questions in their notebooks.
  • Write in vertical form and subtract:
      1. 2321 from 6853
      2. 5034 from 7649
  • At the end, solve these questions on the board and ask the students to check their work.
  • Provide guidance to the students having mistaken.

Sum up / Conclusion

  • In vertical method of subtraction, first of all we arrange the numbers in columns according to the place value and then subtract the digits in the same order.
  • In horizontal method of subtraction, first of all we arrange the numbers in rows according to the place value and then subtract the digits in the same order.

Assessment

  • Ask the students to solve the following questions in their notebooks:
      1. Subtract 6315 from 7568 vertically
      2. Subtract 4350 from 86999 horizontally.

Subtraction

Follow up

  • Subtract five hundred and four from five thousand, nine hundred and sixty-seven.

Ask the students to solve the questions given in their notebooks

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