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Key Point: 1 L = 1000 mL
What is Capacity?
Capacity is the amount of liquid a container can hold. It tells us how much space is available inside a jug, bottle, mug or any container for holding liquids.
Units we use: The common metric units are litre (L) and millilitre (mL). 1 litre = 1000 millilitres.
How to measure capacity:
Simple ideas to remember:
Working with capacities (examples shown here): If you need to add or compare capacities, first make sure both are in the same unit (convert L to mL or mL to L), then add or compare. For example, three bottles of 500 mL each have a total capacity of 1500 mL, which is 1 L 500 mL.
Note for learners: Capacity is for liquids (how much a container will hold). In later classes you will learn volume for solids, but for Class 4 we treat capacity and volume of liquids as the same idea: amount of space for liquid, measured in litres and millilitres.
Key Point: 1 litre (L) = 1000 millilitres (mL)
What is capacity? Capacity is the amount of liquid a container can hold. In Class 4 we use units like litre (L) and millilitre (mL). We often say one container has more capacity, less capacity, or equal capacity compared to another.
Common units: 1 litre (1 L) = 1000 millilitres (1000 mL). Small bottles and cups are usually measured in mL; jugs and big bottles are often measured in L.
How to compare two capacities — step by step:
Quick tips:
Simple comparisons (examples shown inside explanation):
This is the basic idea of comparing capacities: convert to the same unit, then compare numbers or perform addition/subtraction as needed.
Key Point: Total capacity = Number of units × Capacity of one chosen unit
What are non-standard units? Non-standard units are everyday objects or informal measures (like a mug, a spoon, a paper clip) used to measure length, area, volume or mass instead of standard units (metre, litre, kilogram). In the chapter "Jugs and Mugs" we use mugs, cups or small containers to measure the capacity of other containers.
Why use non-standard units? They help young learners understand the idea of measurement by counting how many equal things fill or cover an object. They are simple, concrete and useful before children learn standard units.
How to measure capacity using non-standard units (step-by-step):strong>
Important points:
Example idea: If a jug is filled by 5 mugs, we say the jug's capacity is 5 mugs. If another jug needs 8 mugs, the second jug is larger because 8 > 5.
Key Point: 1 L = 1000 mL
What is a litre? A litre (symbol: L) is the standard unit used to measure capacity — how much a container can hold. We use litres to measure liquids like water, milk, juice, and oil.
Common subunits:
How to convert: To change litres into millilitres, multiply by 1000. To change millilitres into litres, divide by 1000. To change litres into centilitres, multiply by 100. Always convert quantities to the same unit before you add or subtract them.
Tools used to measure: measuring jug, bottle with labelled capacity, mug, glass, water tanker. Measuring jugs usually have marks for mL and L.
Quick tip: 1 mL is the same volume as 1 cubic centimetre (1 mL = 1 cm³). This fact is useful when switching between measuring shapes and containers.
Key Point: 1 L = 1000 mL
What is capacity? Capacity is the amount of liquid a container can hold. We measure capacity using units such as millilitres (mL) and litres (L).
What is a measuring jar? A measuring jar (or measuring cylinder/jug) is a clear container with markings showing volumes (for example 50 mL, 100 mL, 250 mL). It helps us measure how much liquid we pour.
How to measure capacity with a measuring jar — step by step:
Finding the capacity of another container: To find how much a bottle or mug holds, pour liquid from the bucket into the measuring jar and count how many full jarfuls it takes. Add any extra part measured in mL.
Important tips for Class 4 students:
Key Point: 1 L = 1000 mL
What is capacity? Capacity is the amount of liquid a container can hold. Common units are litre (L) and millilitre (mL). 1 L = 1000 mL.
Basic idea: To add or subtract capacities, first make sure the amounts are in the same unit (all L or all mL). Then add or subtract the numbers. If you have mixed units (litres and millilitres together), convert one unit to the other before calculating.
Steps for addition (example method):
Steps for subtraction (example method):
Worked examples in words: 2 L 350 mL + 1 L 800 mL = (350 + 800) mL = 1150 mL = 1 L 150 mL. Now 2 L + 1 L + 1 L (carried) = 4 L. Final answer = 4 L 150 mL. For subtraction: 5 L 200 mL − 2 L 750 mL. Since 200 mL < 750 mL, borrow 1 L (1000 mL): 4 L 1200 mL − 2 L 750 mL = 2 L 450 mL.
Things to remember: Always align units and convert when needed. Use carrying in addition when mL ≥ 1000. Use borrowing in subtraction when mL in minuend is smaller than mL in subtrahend.
Key Point: 1 litre (L) = 1000 millilitres (mL)
What is Estimation?
Estimation is a way of finding an approximate value that is close to the exact answer. In Jugs and Mugs, we estimate how much liquid a container (jug, mug, glass) holds without measuring exactly. Estimation helps us decide quickly in daily life — for example, whether a jug is enough to fill two mugs.
What is Reasoning?
Reasoning means using logical thinking to explain why an estimate makes sense. We use what we know (benchmarks and prior measurements) to compare, choose, or check answers. For example, if one mug looks about half of a 1-litre bottle, reasoning tells us the mug is about 500 mL.
Simple steps for Estimation and Reasoning with capacities:
Tips for children:
Why this helps: Estimation saves time, helps check answers, and builds number sense by connecting measurements and everyday objects.
Key Point: 1 litre (L) = 1000 millilitres (ml)
Practical Activities and Exercises help children understand capacity by measuring, comparing and using jugs, mugs and bottles. These activities teach how to read measuring jugs, estimate amounts, convert between litres and millilitres, add and subtract volumes and record results in a simple table.
What students learn: identifying units (litre, millilitre), using a measuring jug, estimating capacity, converting units, and solving everyday problems (how many mugs fill a jug?).
Suggested classroom activities:
How to record results: make a table with columns: Container, Measured Capacity (ml), Capacity (L), Notes. Convert using 1000 ml = 1 L and show any sums or differences.