Filling and Lifting
Class 3 · Mathematics
6 ideas in Class 3 Mathematics, explained in plain words, with games and quizzes to practise.
Comparing Containers by Capacity
Part of: Capacity and Volume Comparison
Capacity is how much a container can hold. Some containers are big and hold a lot of juice or water. Others are small and hold just a little. When you pour milk from one cup into another cup that is bigger, the bigger cup can hold it all and still have room for more. For example, a large bucket holds much more water than a small cup.
Why it matters. Learning to compare container sizes helps children understand quantities and makes everyday tasks easier. When you pour juice into a cup or water into a bucket, you need to know which container will work best. This skill helps in cooking, storing things, and making good choices about which container to use.
Try it in two minutes
- Gather three containers of different sizes: a small cup, a medium bowl, and a large pot.
- Fill the small cup with water and pour it into the medium bowl. Ask: 'Does it fill the whole bowl or just part of it?'
- Fill the medium bowl with water and pour it into the large pot. Ask: 'How many medium bowls do you think would fill this large pot?'
- Let your child pour water between containers to see which holds more water.
Try at home. Ask your child to find three containers at home and arrange them from smallest to largest by pouring water between them.
Using Non-Standard Units to Measure Volume
Part of: Capacity and Volume Comparison
Before we had standard units like liters, people measured things using what they had at home. A farmer might say 'This jar holds about 5 bowls of rice' or 'The pot holds 10 cups of water.' By using a standard object like a cup or bowl as a measuring tool, you can figure out how much something holds. For example, if a jug holds exactly 4 glasses of water, you can say the jug's capacity is 4 glasses.
Why it matters. Learning to measure with non-standard units teaches children that you can compare quantities using any repeated object. This builds the foundation for understanding measurement. It helps children solve real problems like 'How many cups of flour do I need for this recipe?' or 'How many buckets of water will fill this tank?'
Try it in two minutes
- Choose a container to be your measuring unit, such as a small cup.
- Fill the cup with water and pour it into a larger container. Count how many cups it takes to fill.
- Try with a different measuring cup size and see if the number changes.
- Ask your child: 'Why do we get a different number when we use a bigger measuring cup?'
Try at home. Use a spoon as your measuring unit. Find out how many spoons of sugar fill a cup. Then try with a larger tablespoon and see if the answer changes.
Understanding the Litre
Part of: Introduction to Standard Units of Capacity
A litre is an agreed-upon standard amount used all over the world. Instead of saying 'this container holds about 5 small bowls,' we can say 'it holds 1 litre.' A litre bottle is easy to recognize in your home. Many milk containers, juice bottles, and water bottles are marked as 1 litre. Once you know what 1 litre looks like and feels like, you can estimate if something holds more, less, or about 1 litre.
Why it matters. Standard units like litres help everyone communicate about amounts in the same way. When a shopkeeper sells milk, both the customer and seller know exactly what a litre means. Learning litres prepares children for understanding other measurements. It builds the foundation for cooking recipes, buying groceries, and solving everyday problems.
Try it in two minutes
- Find a 1 litre water bottle or milk container at home.
- Feel the weight of it in your hands when it is full.
- Show your child and ask them to hold it. Ask: 'This is 1 litre. Does it feel heavy or light?'
- Fill a cup or bowl with water and ask your child to guess if it is more or less than 1 litre.
- Pour water from the cup into the 1 litre bottle to check. Was the guess right?
Try at home. Take your 1 litre bottle and ask your child to find other things at home that might hold more than 1 litre or less than 1 litre. Test each one together.
Half and Quarter Litre Measurements
Part of: Introduction to Standard Units of Capacity
Just like you can break a pizza into slices, a litre can be broken into smaller amounts. Half a litre is exactly half of 1 litre, and a quarter litre is one-fourth of 1 litre. If you fill a 1 litre bottle and then pour half of it out, you have half a litre remaining. Two half litres make 1 litre. Four quarter litres make 1 litre. These smaller measurements help us be more precise when we need less than a full litre.
Why it matters. Learning about fractional litres helps children understand that measurements can be divided. When cooking, recipes often ask for half a cup or three-quarter cups of milk. Understanding parts of a litre prepares children for these real-world situations. It also builds mathematical thinking about fractions in a practical way.
Try it in two minutes
- Take a 1 litre bottle and mark it halfway up with a tape or marker. Fill it to the mark and say 'This is half a litre.'
- Mark a quarter-way point and fill to there. Say 'This is a quarter litre.'
- Ask: 'How many quarter litres make a half litre?' (Answer: 2)
- Ask: 'How many half litres make 1 litre?' (Answer: 2)
- Ask: 'How many quarter litres make 1 litre?' (Answer: 4)
Try at home. Use a measuring cup if you have one. Fill it to half a litre or quarter litre markings. Then estimate: does a glass hold about a quarter litre or less?
Comparing Objects by Weight
Part of: Weight and Mass Comparison
Weight is how heavy something is. When you hold two things in your hands, one might feel heavier and the other lighter. A heavy object pushes down on your hand more than a light object. You do not need a scale to know that a book is heavier than a feather or a watermelon is heavier than an apple. By holding things or using a simple balance, you can feel and see which is heavier.
Why it matters. Understanding weight helps children make choices in everyday life. They learn to select the right container for things they carry, understand why some bags are harder to carry than others, and develop a sense of how heavy different objects are. This skill connects to sports, cooking, and helping with household tasks.
Try it in two minutes
- Hold a pencil in one hand and a book in the other. Ask: 'Which is heavier?'
- Hold an apple in one hand and a marble in the other. Ask: 'Which one makes your hand drop lower?'
- Collect several objects: a toy, a shoe, a piece of paper, a potato. Ask your child to arrange them from lightest to heaviest by holding them.
- Verify by weighing on a scale if you have one, or by using a simple balance.
Try at home. Play a game: Put one object in each hand behind your back. Your child guesses which hand has the heavier object before you show them.
Using Standard Units: Kilogram
Part of: Weight and Mass Comparison
A kilogram, or kg, is the standard unit for measuring weight used all over the world. One kilogram is the same whether you are in India or any other country. Many objects at home have their weight marked on them: a bag of salt might say 1 kg, a packet of flour might say 2 kg. A kilogram is fairly heavy. To understand what 1 kg feels like, hold a bag of salt or sugar that weighs 1 kg. Once you know, you can guess if something is lighter than 1 kg, about 1 kg, or heavier than 1 kg.
Why it matters. Learning about kilograms helps children understand standard measurements. When shopping, groceries are sold by kilogram. At the doctor, your weight is measured in kilograms. Understanding kilograms prepares children for daily life and helps them estimate weights accurately. It is a foundation for science and cooking.
Try it in two minutes
- Find a 1 kg packet at home, such as salt, sugar, or flour.
- Let your child hold it and feel its weight. Say: 'This weighs 1 kilogram or 1 kg.'
- Have them hold other objects and ask: 'Is this heavier than 1 kg, lighter than 1 kg, or about the same?'
- Collect 3 or 4 objects and arrange them from lightest to heaviest.
- If you have a scale, verify the guesses.
Try at home. At the market or grocery store, show your child items labeled with their weight in kilograms. Buy a variety and compare them at home.
What your child will practise
- Comparing Containers by Capacity: Jungle Quest (Collect the Answer)
- Comparing Objects by Weight: Candy Quick Fire (Quick Fire)
- Half and Quarter Litre Measurements: Desert Puzzle (Clue Puzzle)
- Understanding the Litre: Kitchen Sort (Sort It Out)
- Using Non-Standard Units to Measure Volume: Ocean Quest (Collect the Answer)
- Quiz: Comparing Containers by Capacity (8 questions)
- Quiz: Comparing Objects by Weight (8 questions)
- Quiz: Half and Quarter Litre Measurements (8 questions)
- Quiz: Understanding the Litre (8 questions)