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

Subject Mathematics

Grade 2^{nd}

Students` Learning Outcomes

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

Information for Teachers

- Question should be written vertically with column headings (Hundreds, Tens and Ones)

- Sign of addition “+” should n`t be written under any column heading.

- There must be space between column headings and numbers to write carry.
- The largest value of a number in any column may be 9.

- While teaching the lesson, the teacher should also consult with textbook where and when applicable.

Material / Resources

Writing board, chalk / marker, duster, beads, counting frame, clips paper strips and dice (make bigger dice with clay), textbook

Introduction

- Write an addition problem on the board (3-digit into 2 or 3-digit numbers without carrying), such as;

- Ask students to solve assigned questions in their notebooks.

Development

Activity 1

- Write an addition question (1-digit into 1-digit) on writing board as; 5 + 3 and provide a counting frame to students in group.

- Ask students to represent 235 on counting frame by putting two beads, three beads and five bead in unit, tens and hundred string respectively.

- Ask them to clip each string and then represent second addendum by putting five beads in unit string.
- 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 tens string.
- Write carry under ten`s place on notebook.
- Count beads in unit string and write beads 1 under the unit on notebooks.
- Combine beads in tens place, count and write number of beads under the column of tens on notebook.
- Then count number of beads in the string of hundred and write under the column of hundred on notebook.

- Give a few more questions of the same difficulty level e.g. 196 + 5. Ask students to repeat the above steps to find the answer of question.

Activity 2

- Distribute strips containing an addition question (3-digits and 1-digits numbers) as such;

67 + 4

435 + 7

756 + 7

173 + 8

- Ask students to solve the question on the same paper strip.
- After solving question, ask students to share with others, how did they solve given question.

Activity 3

- Divide students in group of 4 or 5 members in each group.

- Give three dices to each group and ask them to roll them.
- Ask them to use all three drawn digits to form a three digit biggest possible number. Discuss with them how the biggest number can be formed: by placing the largest of the 3 numbers on the place value of hundred.
- Ask them to add 9 to their formed number and share sum with other groups.

- Group having largest sum will be the winner group.

Sum up / Conclusion

- Discuss with students what will happen when the sum of two digits becomes more than nine.

- Demonstrate with material that as a number become more than 9 we replace ten with one and add in the next column heading.

Assessment

- Give counting frame to the students along with some questions to solve such as;

445 + 5

765 + 6

784 + 9

609 + 8

Follow up

- Assign some addition questions (3-digits with 1-digit numbers with carry) to solve as homework.

- Ask the students to solve the questions given in their textbook.