Lesson Plan of Addition of Units of Length
Subject Mathematics
Grade III
Students` Learning Outcomes
- Add measures of length in same units with and without carrying.
- Solve real life problems involving same units of length for addition with and without carrying.
Information for Teachers
- In addition of lengths, centimeters are added into centimeters, meters into meters and kilometers into kilometers.
- If the addition of centimeters exceeds 100, then number of meters so obtained is added into meters e.g.
- If the addition of meters exceeds 1000, then number of kilometers so obtained is added into kilometers, e.g.
- Question should be written vertically under column headings (km, m, and cm).
- Sign of addition “+” should not be written under any column heading.
- While teaching the lesson, also consult textbook where and when applicable.
Material / Resources
Writing board, chalk/marker, duster, meter rod, measuring tape, paper strips, textbook
Introduction
- Give two paper strips of different lengths (m, cm) to each student.
- Ask them to measure their length and write the measurements on notebook.
- Ask them to add the lengths of the 2 strips.
Development
Activity 1
- Ask the students to sit in pairs.
- Ask them to think of estimate of their heights.
- Call one of the pairs and ask to write their height on board under column heading.
- Now ask them to add their height on board.
- We add “cm” into “cm” and “m” into “m”.
- Ask the students to note down this question in their notebook.
- Call two or three pairs to repeat this activity.
Activity 2
- Draw and write the following on the board or chart.
- How much distance does Ali cover from home to school and school to Razz’s home?
- Call one of the students and ask him to write the units of length on board which is used in this statement. (Km and m).
- Ask from another student, “How much distance does Ali cover from home to school?” (5km 800m)
- Write 5km 800m under units heading on board.
- Ask from third student, “How much distance does Ali cover from school to Razz`s home? (4km 250m)
- Write 4km 250m below first value on board.
- Tell them to find the total distance; we will add “m” and “km” into “km”.
- Ask the students to add the meters.
- Tell them as the number of meters exceeds 1000 e.g. 1050m = 1km + 50m.
- So we write 50 below meters and carry 1km to kilometers columns.
- Add kilometers; 5km + 4km + 1km =10km
Activity 3
- Ask the students to solve the following sums in their notebook.
- Tell them, if the number of centimeters exceeds 100 then number of meters obtained is added into meters and if the number of kilometers obtained is added into kilometers.
- Observe their work and guide them where necessary.
- Revise the relation between “cm”, “m” and “km” by asking from students.
Sum up / Conclusion
- Centimeters are added into centimeters, meters into meters and kilometers into kilometers.
- If the centimeters are 100 or more than 100, we carry the meters to the meters column.
- Similarly if the meters are 1000 or more than 1000, we carry the kilometers to the kilometers column.
- Question should be written vertically under column headings.
Assessment
- Ask the students to solve the following sums:
- A boy has two pieces of string of the lengths 47m 35cm and 57m 85cm. find the total length of two strings.
- How much distance Ahsan cover daily from home to mosque, mosque to school and school to home?
Follow up
- Measure the heights of your family members and find the total height of them. Solve it in notebook.
- Ask the students to solve the questions given in the textbook.
