# Lesson Plan of Addition of Units of Length

## 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.

### 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.
• 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”.
• 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?