In this lecture, young learners will explore the concept of length, understand metric units (millimetre, centimetre, metre, kilometre), and learn how to add and subtract measurements without carrying or borrowing. Through real-life examples and engaging exercises, students will master how to: Use standard metric units and their abbreviations Add and subtract same-unit measurements Solve real-world problems involving length Work with tools like measuring tapes and rulers Apply concepts using unit conversion (cm ⇄ m ⇄ km) Bonus: Includes exercise solutions, word problems, and a comprehensive test with MCQs, fill-in-the-blanks, and match-the-columns (Answer Key included!).