This chapter teaches students how to measure weight (mass) and capacity using standard units. Weight is measured in milligrams (mg), grams (g), kilograms (kg), quintals, and tonnes, while capacity (mainly for liquids) is measured in millilitres (ml) and litres (l).
Students learn important conversions such as:
1 kg = 1,000 g
1 g = 1,000 mg
1 l = 1,000 ml
The chapter focuses on converting units correctly, reading analog and digital scales, and performing addition and subtraction of weights and capacities by aligning units properly. Through real-life examples like measuring groceries, liquids, and daily usage items, students understand the practical use of weight and capacity in everyday life.
Overall, this chapter builds accuracy in measuring, converting, and calculating weights and capacities confidently.
Key Points
• Weight (Mass): Measures how heavy an object is. Units: grams (g) for light items, kilograms (kg) for heavier ones.
1 kg = 1,000 g; 1 g = 1,000 mg
Larger units: quintal (100 kg), tonne (1,000 kg)
• Capacity: Measures how much a container can hold—mainly liquids. Units: millilitres (ml) and litres (l).
1 l = 1,000 ml
• Unit Conversions – Weight:
Convert kg → g by multiplying by 1,000
Convert g → kg by dividing by 1,000
Convert between kg, quintals, tonnes by grouping (e.g., 5,000 kg = 50 quintals = 5 tonnes)
• Unit Conversions – Capacity:
Convert l → ml or vice versa by using 1,000 factor
Group litres and millilitres when performing calculations
• Reading Scales:
Read both analog and digital scales; pay attention to units and divisions (e.g., 100 g or 10 g per small division)
• Real-Life Applications:
Converting weights like 5 kg 50 g = 5,050 g
Scaling quantities—e.g., total onions used in days, flour used, etc.
Working with money or sales where weight/capacity are involved
👉 👉 Knowing Weight and Capacity is about far more than numbers—it’s about understanding how much things weigh or hold in real life. From cooking to transporting goods, accurate measurement helps us plan better, avoid mistakes, and work smarter.