Capacity Exploration Fun

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🧠 Overview

Unit Title: Capacity Counts: Litres & Millilitres
Lesson: 1 of 3
Lesson Title: Exploring Litres and Millilitres
Time: 60 minutes
Year Group: Year 3
Class Size: 19 pupils
Curriculum Focus:
Key Stage 2 (Lower KS2) – Mathematics
National Curriculum Link:

• Measurement:

  "Measure, compare, add and subtract: lengths (m/cm/mm); mass (kg/g); volume/capacity (l/ml)."

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🎯 Learning Objectives

By the end of this lesson, pupils should be able to:

1. Understand and explain what litres and millilitres are.
2. Accurately measure capacity using standard metric units (l and ml).
3. Convert between litres and millilitres (e.g. 1 litre = 1,000 millilitres).
4. Record measurements clearly and use appropriate units.
5. Estimate and then measure to compare actual capacity values.

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✨ Success Criteria

Pupils will:

• Use metric measuring jugs to measure water confidently in ml and l.
• Accurately complete a table to record the capacity of various containers.
• Begin to explain the relationship between litres and millilitres.
• Ask questions and share observations using key vocabulary.

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📚 Vocabulary

• Litre (l)
• Millilitre (ml)
• Capacity
• Measure
• Estimate
• Convert
• Overflow
• Container

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⏱️ Lesson Breakdown (60 Minutes)

1️⃣ Starter (10 mins): "What’s in a Bottle?"

Purpose: To activate prior knowledge and introduce the concept of capacity.

Resources:

• Mystery container box (includes objects like a juice carton, a small glitter bottle, shampoo bottle, mini milk bottle)
• Whiteboard

Activity:

1. Show the class a sealed box titled: “Capacity Mystery Box.”
2. Pull items out, one at a time.
3. Ask, “Which of these hold more water?” “Which holds less?”
4. Use comparative language — bigger, smaller, holds more, less — to guide their thinking.
5. Write: Litre and Millilitre on the board.
6. Ask: “Does anyone know these words? What do you think they mean?”

Teacher Tip: Record pupil suggestions and build excitement for working with real water.

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2️⃣ Input (10 mins): "Meet the Measures"

Purpose: To explicitly teach the relationship between litres and millilitres.

Teacher Modelling:

• Show a 1-litre bottle and a measuring jug marked with ml.
• Clearly pour 1 litre of water into jug and highlight it reaches 1,000 ml.
• Write on the board:
  1 litre = 1,000 millilitres

Mini-Discussion:

• Pupils repeat the equivalence aloud together.
• Ask: “If half the jug is full, how many millilitres is that?” (Prompt for 500 ml with guidance.)

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3️⃣ Main Activity (25 mins): "Water Lab Investigation!"

Purpose: To provide hands-on capacity measurement experience.

Resources (per group of 4):

• Measuring jugs
• Water tubs
• Cloths/spill trays
• Variety of containers (e.g., yoghurt pots, small bottles, mugs, jam jars, kitchen ladles)
• Capacity recording charts
• Conversion cards (e.g., 750 ml = __ l)

Grouping:

• Pupils in mixed ability groups of 4-5. One group of 3 to accommodate 19 pupils.

Instructions:

1. Each group selects 4 containers.
2. Estimate how much each holds — record in ml.
3. Fill carefully with water, measuring amounts precisely using jugs.
4. Record actual capacity in ml.
5. Use "Conversion Cards" to express some answers in litres and millilitres.

Extension Challenge:

• Calculate how many of the smallest container are needed to fill the biggest one.
• Convert all measurements into both ml and l.

Teacher Role:

• Circulate, question children's reasoning, assess pouring accuracy, encourage precise readings and support discussions.

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4️⃣ Reflect and Reason (10 mins): "Capacity Chat"

Discussion Questions (Whole Class):

• “Which container was the most surprising?”
• “Did your estimates match your measurements?”
• “Why is it useful to know how many ml are in a litre?”
• "If a bottle says it holds 1.5 litres, how many millilitres is that?"

Plenary Activity:
Place three mystery containers filled with coloured water at the front:

• Ask students to vote by standing near the one they think holds 1 litre.
• Reveal the correct answer and discuss why.

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📝 Assessment Opportunities

Formative Assessment:

• Observing group discussion and practical measuring
• Listening for use of specific vocabulary
• Recording accuracy on measurement sheets
• Exit question: "Millilitres or litres – which would I use to measure a teacup?"

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🎒 Resources List

• Mystery container box with varied household containers
• Large measuring jug marked with ml and l
• 1-litre bottle (clearly marked)
• Plastic trays and cloths (to manage spills)
• Water containers for refilling
• Capacity recording sheet (template provided to TA/Teacher)
• Dry-wipe boards and pens
• Pre-made conversion cards (ml ⇄ l)

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🌟 Teacher WOW Moment

Turn your classroom into a "Mini Capacity Laboratory" – provide lab coats or apron bibs from the drama department, label each group as “Measurement Scientists”, and let them ring a bell when capacity reaches an exact litre. Pupils love the sense of occasion, and it turns measuring water into a real-world STEM experience.

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📌 Notes for Next Lesson

This is Lesson 1 of 3. In the next session:

• Pupils will explore estimation further and begin comparing different capacities to solve real-world problems.
• Consider incorporating role play with real-life scenarios (e.g., following a drink recipe or preparing a smoothie with specific volumes).

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📖 Differentiation Strategies

Support:

• Provide scaffolding visuals to show measuring jugs and conversion charts.
• Pre-marked containers for pupils with SEN or EAL learners.
• Adult support available to guide measuring.

Challenge:

• Pupils estimating and reasoning with decimals (e.g., 1.2 litres).
• Extension problems involving addition and subtraction of capacities.

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📬 Home Learning (Optional Extension)

Family Kitchen Measurement Hunt
Challenge pupils to look at different containers at home (e.g., shampoo, juice cartons, tins of soup) and write down:

• How much liquid is in each (l or ml)
• Which is the largest and which is the smallest?

They can bring their findings to be displayed on a “Volume & Capacity Walk of Fame!”

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Prepared by: Easily Adaptable for Teaching Assistants, EAL or SEN Support Staff

Ready to Print: Measurement Charts, Conversion Cards & Lab Labels available from shared staff drive folder.