Part-Whole Model Addition — Interactive Lesson (Ages 5–6)

Want a visual way to help pupils see how two parts combine to make a whole? This 15-slide interactive lesson uses the part-whole model to build a genuine conceptual understanding of addition, not just number-crunching.

Mastering the Part-Whole Model in Year 1 Maths

Pupils practise using the part-whole model to understand how two parts combine into a whole amount, building the conceptual foundation within the Year 1 National Curriculum area of addition and subtraction. Seeing the relationship visually, rather than just adding numbers, helps pupils understand addition and subtraction as two sides of the same relationship.

What’s Included

• 15-slide interactive lesson on the part-whole model
• Visual representation of parts combining into a whole
• Self-marking activities with instant feedback
• A clear, step-by-step build-up rather than one abstract explanation

Key Benefits for Students

• Builds genuine conceptual understanding, not just calculation
• Instant feedback confirms correct answers straight away
• Connects addition and subtraction as related ideas
• A strong foundation for later bar-model and algebraic thinking
• Encourages pupils to explain their reasoning, not just state an answer

Why Teachers Love It

• No prep — ready to use on any interactive whiteboard
• Self-marking activities support independent practice
• Builds a model pupils will keep using throughout primary maths
• A concise, focused lesson that fits neatly into a single session

Love this? You’ll love…

• Sorting Objects — Interactive Lesson (Year 1)
• Doubling To 20 — Interactive Lesson (Year 1)
• Adding Doubles — Worksheets and Activity Packet (Ages 5–6)

The part-whole model introduced here underpins much of the addition and subtraction work pupils will meet across the rest of Year 1 and beyond, so it’s genuinely worth pupils mastering it early on, rather than treating it as a one-off topic covered once, quickly left behind and then largely forgotten.

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FAQ

What year group is this for? Year 1 (ages 5–6).

What is the part-whole model? A visual way of showing how two parts combine to make a whole amount.

Is it self-marking? Yes, instant feedback throughout.