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.
- 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:
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- Up to how many digits you can subtract numbers?
- From where do we start subtracting the numbers, right or left?
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- 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:
- 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
- Subtract vertically:
- 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:
- 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:
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- 2321 from 6853
- 5034 from 7649
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- 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:
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- Subtract 6315 from 7568 vertically
- Subtract 4350 from 86999 horizontally.
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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