LESSON PLANNING OF ADDITION BY CARRYING OVER
Students` Learning Outcomes
- Add ones and ones.
- Add ones and 2-digit numbers with carry.
Information for Teachers
- Addition is “putting together” of two groups of objects and finding how many in all.
- This is first time students will learn addition with carry.
- They have already learnt about addition without carry and also know that 10 ones make one ten.
- Questions should be written vertically with columns headings (units and tens).
- Sign of addition + should n`t be written under any column heading.
- While teaching the lesson, teacher consult textbook where and when applicable.
Material / Resources
Writing board, chalk / marker, duster, ice-cream sticks, number flashcards and counting frame
- Ask the students; if they have 9 units and add two more to them how many do they have? (11)
Make a bundle of ten sticks and ask how many sticks are in this bundle? (11)
- How many tens are in this bundle? (1)
- Give simple addition questions on the board to make tens. Like;
1 + 9 =?
8 + 2 =?
7 + 3 =?
4 + 6 =?
5 + 5 =?
- Pose a situation e.g. Ali has 7 sticks in one hand and 5 sticks in the other hand, how many total sticks he has?
- Draw sticks on the board and count aloud.
- Write on the board, like; 7 + 5
- Give some match sticks to students; ask them to separate 7 and 5 sticks.
- Ask them to combine these sticks and count. As soon as they reach at the ten remind them to make a bundle of ten sticks.
- Now ask students how many loose sticks and tied sticks they have?
- Write on board as; 7 + 5 = 12
- Explain that in 12, 1 represents ten and 2 represent units.
- Repeat for other single digits numbers whose sum is greater than 9.
- Give an addition question along with match sticks; 19 + 8 = ……
- Ask them to show the sticks in first number, as tens and unit; bundle of ten and loose unit sticks.
- Show sticks for second number
- Add unit sticks in both numbers
- Ask how many unit sticks we have? (17)
- Can we write 17 as units? (No), show as bundle of ten and unit sticks.
- Combine them and see how many bundles of ten they have?
- How many units do we have now? (7).
- How many tens? (2)
- Now write addition as;
- Guide students for the column addition with the examples.
- Write an addition question (2-digit and 1-digit) on board; like 25 + 8 =?
- Ask one student to represent 25 on counting frame by putting 5 red beads in the unit`s string and 2 yellow beads in ten`s string.
- Clip each string and then represent second addend by putting eight beads in unit`s string.
- Remove the clip from the unit`s string.
- Ask how many beads there are in unit`s string? (13)
- Can we have 13 beads in unit`s string? (No)
- Ask students what to do now?
- Ask one child to take out 10 red beads from unit`s string and put one yellow bead in ten`s string.
- Ask how many red beads in unit`s string? (3)
- How many yellow beads in ten`s string? (3)
- Write the process in column addition and explain to the students.
- Give the students more questions of this type to solve.
- Ask the students to solve the questions given in their textbook.
- Observe their work and guide them where necessary.
- Assign some questions to the students as home work from textbook.
Sum up / Conclusion
- Discuss with students that when the sum of two digits becomes 10 or more than 10 we get 1 tens.
- In addition of 2-digit numbers, we add ones to ones and tens to tens.
- If, in the unit`s column units are 10 more than 10, we carry 1 ten to the ten`s column.
- Give the following worksheet to students, to complete.
- Ask the students to write examples from daily life where they need to add things which are more than 10 in quantity.
- Ask the students to solve the questions given in their textbook