LESSON PLANNING OF 3-DIGIT NUMBERS AND 2-DIGIT NUMBERS WITH CARRY OF TENS AND HUNDREDS

Subject Mathematics

Grade 2^{nd}

Students` Learning Outcomes

- Add 3-digit numbers and 2-digit numbers with carry of tens and hundreds.

Information for Teachers

- The number system we work is base ten systems.

- Place value increases from right to left.

- Maximum value at any place is 9.
- Place value changes with the multiple of ‘10’.

- While teaching the lesson, the teacher should also consult with textbook at all steps where and when needed.

Material / Resources

Writing board, chalk / marker, duster, beads, counting frame, clips, paper strips, dices (make big dice with clay), chart

Introduction

- Write a word problem on board (addition of 3-digit number and 1-digit number with carry) such as;

- Ask students to solve it in pairs and make each other understand the problem.
- Ask about the question from few students.

Development

Activity 1

Present a real life situation in which we use addition such as;

Discuss the situation with students and write; 145 + 45 on the board and provide a counting frame to student in group.

- Ask students to represent 145 on counting frame by putting five beads, four beads and one bead in unit, tens and hundred string respectively.
- Ask them to clip each string.
- Ask them to insert six and seven beads in unit and ten place string respectively to represent 45.
- Ask them to remove clip in unit string, count and when reach at ten remove them from unit string and exchange with one bead at ten`s string.
- Write questions in their notebooks.

- Count beads in unit string and write 1 under the unit on notebook.
- Write carry under ten in their notebooks.
- Continue this practice for ten places.
- Ask students to write carried number under hundred, count beads in ten and hundred string and write in them notebook.
- Give a question of different difficulty level e.g. 196 + 145. Ask students to repeat the above steps and find the answer of question.

Activity 2

- Distribute paper strips in groups containing an addition question (3-digits and 2-digits numbers) e.g. 167 + 54, 435 + 87, 796 + 17, and 193 + 68.
- Ask students to solve the question on the given piece of paper.
- After solving question ask students to paste their work on chart paper.
- Display chart paper in the class and ask students to come and observe work done by different students.
- Ask them to identify mistakes and write their comments along with each work. So after that discuss with students how to ad numbers and where they made a mistake. (If any)

Activity 3

- Give three dice to students in group and ask them to roll them.
- Ask them to form a three digit biggest possible number with these drawn digits, by putting the largest of the 3 numbers at place value hundredth and the second largest on place value ten.
- Ask them to add 99 to their formed number and share the sum with other groups.
- Group having greatest sum will be the winner group.

Sum up / Conclusion

- Discuss with students what will happen when sum of two digits becomes more than nine?
- Discuss what will happen when carrier place already has more than ten?
- Demonstrate with beads that as soon as in a string / place number become more than 9 we replace ten beads with one and carry in the next column heading and this process continue for next place.

Assessment

- Give counting frame to students along with some questions to solve e.g. 445 + 65, 765 + 66, 794 + 19, 699 + 78 etc.
- Write few 3-digits and 2-digits numbers on the board and ask students to add any two of them.

Follow up

- Assign some addition questions of 3-digit and 2-digit numbers (with carry), and also 3-digit and 3-digit numbers (with carry) to solve as homework.
- Ask students to cut three, 2” x 2” cards or papers and write 2 sums of addition of 3-digits and 2-digits on each card. Collect and use these cards in next lesson or reinforcement.
- Ask the students to solve the questions given in their textbook.