Lesson Planning of Subtraction of Units of Length
Subject Mathematics
Grade 3^{rd}
Students` Learning Out comes
 Subtract measures of length in same units with and without borrowing.
 Solve real life problems involving same units of length for subtraction with and without borrowing.
Information for Teachers
 Same units of measurement can be subtracted.
 Centimeter can be subtracted from centimeter
 Meter can be subtracted from meter.
 Milometer can be subtracted from kilometre.
 While teaching the lesson, the teacher should also consult textbook at all steps wherein and whenever it is required.
Material / Resources
Writing board, chalk/marker, duster, pointer, ruler, meter rod, and measuring tape
Introduction
 Ask from students:
 If you have ten pieces of chocolate and you gave three pieces to your friends. How many pieces are left?
 Similarity if a piece of string is cut the length of the string is reduced and we can find the new length of the string.
Development
Teaching Approach
Demonstration, discussion
Activity 1 (Problem solving)

Activity 2
Centimeter, Centimeter 4 9 cm 8 5 cm – 3 7 cm 2 4 cm 1 2 cm 6 1 cm Meter, Meter 3 5 m 8 5 m 1 2 m – 6 2 m 2 3 m 2 3 m Kilometre, Kilometre 1 9 8 km 1 8 5 km – 7 6 km – 8 5 km 1 2 2 km 1 0 0 km 
Sum up / Conclusion
 How we could find the difference between the lengths?
 Can we different units?
 Which is the smaller unit of length?
Assessment
 Ask the students to find the difference between lengths:
 60 cm – 20 cm = ———?
 86 km – 52 km = ——–?
 150 cm – 45 cm = ———?
 100 km – 89 km = ———?
 Teacher is required to involve the students in solving the problems given in the exercise at the end of unit/chapter.
Follow up
 During morning walk. Ali walks 600 m, but his friend walks 520m. how much distance does Ali walks more than his friend?
 What is the difference between 452 km and 126 km ?