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.
- 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:
- 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.
- 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:
- 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:
- Count how many ‘tens’ and ‘ones’ and then add:
- 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:
-
- 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:
- 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).
- Ask the students to solve the questions given in the textbook.
