# Lesson Plan of Addition up to 100

## 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:

• 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.

• 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.

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