Adding Decimal Amounts

Overview

Duration: 60 minutes
Class Size: 11 students
Unit: Money Matters: Decimals and Change
Lesson Number: 2 of 3
Topic: Adding decimal amounts with UK money
Age group: Year 3 (7-8 years old)
National Curriculum Links:

• Mathematics Programme of Study for Key Stage 2 (Years 3-4) – Number: Addition and subtraction
• Pupils should be taught to:
  • Add and subtract amounts of money to give change, using both £ and p in practical contexts (National Curriculum, Mathematics KS2)
  • Understand place value in decimals to two decimal places (related from earlier units)

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Learning Objectives

By the end of this lesson, pupils will:

• Understand and apply addition of decimal numbers in the context of money, involving pounds (£) and pence (p).
• Accurately add two or more decimal amounts, recognising the place value of tenths and hundredths.
• Use real-life, practical contexts, such as shopping scenarios, to demonstrate their understanding.
• Work collaboratively in teams to apply addition skills through competitive and fun games.

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Curriculum Reference

• Number – Addition and Subtraction: Add and subtract numbers with up to two decimal places, including money.
• Measurement - Money: Recognise and use symbols for pounds (£) and pence (p); combine amounts to make a particular value.
• Mathematical Fluency: Develop fluency in addition of decimals through structured practice and mental strategies.

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Resources

• UK coin and note replicas or printable cut-out UK money (up to £10)
• ‘Shop’ counters and price labels
• Whiteboards, markers, and wipes for each pupil
• Printed worksheets with shopping lists and price addition exercises
• Timer or stopwatch
• Reward stickers or tokens for motivation

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Lesson Structure

1. Starter Activity – Decimal Warm-Up (10 minutes)

Objective: Recap place value of decimals in money context.

• Begin with a whole-class quick quiz using mini whiteboards. Show an amount (e.g., £3.25) and ask questions:
  • Which digit is in the pounds place?
  • What does the 2 represent?
  • How many pence altogether?
• Use quick-fire questioning to reinforce understanding of place value and decimals.
• Highlight that the first digit after the decimal is ‘tenths’ or in monetary terms, 10p, and the second digit is ‘hundredths’ or 1p.

Teacher Tip: Model with a large visual number line including decimal amounts or money amounts.

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2. Main Activity Part 1 – Role-Playing Shop Scenario (20 minutes)

Objective: Apply addition of decimal amounts through a practical activity.

• Split the class into pairs or small groups (3 or 4, max 4). Provide each group with a ‘shop’ set-up: items labelled with prices (decimals in £ and p, e.g., £1.45, £2.70, £0.95).
• Give each group several ‘money amounts’ (play money) to ‘buy’ items.
• Pupils take turns to ‘purchase’ 2 or 3 items, adding the prices together using whiteboards to work out the total cost.
• Encourage pupils to write each addition vertically, lining up decimal points, reinforcing correct place value.

Teacher Support: Circulate and check calculations for accuracy, prompting with questions like:

• Can you line up the pence and pounds?
• What is the first step in adding these amounts?
• How do you carry over 10p to the pounds column?

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3. Main Activity Part 2 – Adding Decimals Team Game (15 minutes)

Objective: Reinforce addition through competitive team games.

• Divide the class into two teams.
• Prepare sets of cards with decimal money amounts (e.g. £0.60, £1.25, £3.10).
• Each round, a team selects 2 or 3 cards and must add the amounts quickly and correctly.
• Points awarded for accuracy and speed. Use a timer to add excitement and encourage quick mental addition.
• Winning team gets a reward (stickers, tokens).

Variation: Use “Beat the Clock” where the whole class tries to answer addition problems shown on the whiteboard in under 30 seconds.

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4. Plenary – Reflection and Consolidation (10 minutes)

Objective: Review learning and assess understanding.

• Ask pupils to individually write down an addition problem involving two decimal amounts (prices) and solve it.
• Select a few pupils to explain their method and answer to the class.
• Use thumbs up/down or a traffic light system to gauge confidence levels on adding decimal amounts.
• Brief recap of key learning points: place value importance, lining up decimals, applying addition to money.

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Assessment

• Continuous formative assessment during paired and group activities by listening to pupils’ explanations and checking recording of sums.
• Observe accuracy in calculations and ability to explain their process verbally.
• Plenary mini-assessment through written addition problems offers insight on individual understanding.
• Note pupils who may need additional support or extension activities based on their performance.

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Differentiation

Support:

• Use physical money counters and place value charts.
• Pair struggling pupils with confident peers.
• Provide addition frames to scaffold vertical addition of decimals.

Challenge:

• Ask more able pupils to add three or four decimal amounts or work with amounts mixed with whole numbers.
• Introduce simple subtraction of decimal money amounts where appropriate.

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Opportunities for Cross-Curricular Links

• English: Reading and writing price labels, shopping dialogues.
• PSHE: Understanding everyday money use, budgeting in simple contexts.
• Computing: Use simple educational apps (offline homework suggestions) for adding decimals.

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Teacher’s Notes and Tips

• Ensure decimal points are clearly identified and emphasise the importance of lining up decimals when adding.
• Foster a positive, supportive classroom culture where mistakes are a valuable part of learning.
• Use praise and rewards to keep enthusiasm high during games.
• Encourage pupils to verbalise their thinking—this helps deepen understanding and communication skills.
• Prepare all physical resources before class to maximise activity time.

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This lesson plan embraces the National Curriculum requirements by embedding decimal place value knowledge and addition skills into purposeful, practical money-handling experiences. The use of role-play and team competition actively engages Year 3 pupils with kinaesthetic and social learning styles, ensuring concepts stick beyond the classroom.