Adding and Subtracting Mixed Numbers — Interactive Lesson (Year 6)

Do your pupils know two ways to add mixed numbers? This 26-slide interactive lesson teaches adding and subtracting mixed numbers with same and different denominators.

Mastering Adding and Subtracting Mixed Numbers in Year 6 Maths

Pupils revisit converting between mixed and improper fractions, then explore different ways of adding and subtracting mixed numbers. They start with the same denominators, then move to different denominators, converting all mixed numbers to improper fractions over a common multiple before calculating. A reasoning question uses Farmer Ted’s rising water level, and a problem-solving question finds the perimeter of a rectangle given fraction side lengths.

What’s Included

• 26-slide interactive lesson on adding and subtracting mixed numbers
• Learning objectives on converting and calculating with mixed numbers
• Same-denominator questions before different-denominator questions
• A common-multiple method for different denominators
• Reasoning and problem-solving questions with instant feedback

Key Benefits for Students

• Builds confidence converting between mixed and improper fractions
• Shows a clear method for different denominators
• Real-context reasoning questions extend understanding
• Instant feedback on answer questions

Why Teachers Love It

• No prep — ready for whole-class teaching on an interactive whiteboard
• A structured lesson that can be split across sessions
• Self-marking questions support independent practice
• Suits teaching, revision and homework
• A dependable lesson before secondary-school fraction work

Love this? You’ll love…

• Simplifying Fractions — Interactive Lesson (Ages 10–11)
• Adding and Subtracting Fractions with Mixed Numbers — Interactive Lesson & Worksheet (Ages 10–11)
• Solving One-Step Equations — Interactive Lesson (Ages 10–11)

A dependable addition to a Year 6 fractions topic, giving pupils a clear route from simple to more complex mixed-number calculations. Secure fraction arithmetic here supports ratio, algebra and later GCSE work.

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FAQs

What year group is this for?
Year 6 (ages 10–11), KS2.

Does it cover different denominators?
Yes — after starting with the same denominators.

Is it self-marking?
Yes, with instant feedback on the questions.