Lesson Plan of Addition up to 100

Lesson Plan of Addition up to 100

Subject Mathematics

Grade III

Students` Learning Outcomes

  • Add numbers up to 100 using mental calculation strategies.

Information for Teachers

  • Mental calculation is a skill that not only helps us to become better at computation, but it also enhances the development of number concepts.

Addition up to 100

  • While teaching the lesson, also consult textbook where and applicable.

Material / Resources

Writing board, chalk/marker, duster, Mathematics textbook

Introduction

  • Write the question on the board:

Addition up to 100

  • Call any student to solve it on the board.
  • On completion, check the work and correct the mistake if any.
  • Tell the students that there is another easier method to solve this question mentally.
  • First break up these numbers into ‘tens’ and ‘ones’.
  • Write on the board like this:

15 = 1 ten + 5 ones

25 = 2 tens + 5 ones

  • Count how many “tens” and “ones” and then add.

Addition up to 100

  • Tell the students that this strategy will help you to add the numbers mentally without solving it on a piece of paper.
  • Tell the students that let us practice some more questions using mental calculation.

Development

Activity 1

  • Write on the board: add 23 and 12 mentally.
  • Ask the students to solve it mentally.
  • Collect their feedback and write in on the board like this:

Addition up to 100

  • Write some other questions on the board and ask the students to solve.
  • Repeat the procedure to solve the question.

Activity 2

  • Write on the board: add 22 and 23 mentally.
  • Tell the students that we have another easier method to solve this.
  • First observe the numbers.
  • We can break the number “23” into 22 and 1 to make calculations simple and easy.
  • Write on the board like this:

Addition up to 100

  • Count how many ‘tens’ and ‘ones’ and then add:

Addition up to 100

  • Using this strategy, the two numbers become the same. For example 22 and 22, so that we can calculate easily.

Activity 3

  • Write the following questions on the board:
      • Add mentally:

Addition up to 100

  • Ask the students to solve these questions using mental calculation.
  • (They will not be allowed to use any paper)
  • Collect their feedback and then ask to solve the questions on the board.
  • Check their strategy to solve the questions.
  • Appreciate the students having correct answers.
  • Provide guidance to the students having mistaken.

Sum up / Conclusion

  • First break up the numbers into ‘tens’ and ‘ones’.
  • Count tens and ones and then add.

Assessment

  • Ask the students to solve these questions mentally:

Addition up to 100 Addition up to 100

  • Collect their answers and appreciate them.

Follow up

  • You want to buy a notebook having price Rs. 65 and a colour pencil box having price Rs. 34. How much total amount do you need to buy these? (Solve it mentally without using any piece of paper).

Addition up to 100

  • Ask the students to solve the questions given in the textbook.

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