Adding and Subtracting Mixed Numbers — Interactive Lesson (Ages 11–14)

Do your students lose marks converting between mixed and improper fractions? This 21-slide interactive lesson teaches adding and subtracting mixed numbers using two clear methods.

Mastering Adding and Subtracting Mixed Numbers in Year 7–9 Maths

Students revisit converting between mixed numbers and improper fractions, then explore different ways of adding and subtracting mixed numbers. They can add the whole numbers and fractions separately, or convert every mixed number to an improper fraction over a common multiple, then simplify the answer. Practice moves from same denominators to different denominators, with problem-solving questions such as the change in a water level and the perimeter of a rectangle.

What’s Included

• 21-slide interactive lesson on adding and subtracting mixed numbers
• A short video within the lesson
• Two methods: work with whole numbers and fractions, or convert to improper fractions
• Drag-and-drop and fill-in-the-blank questions with instant feedback
• Reasoning and problem-solving questions plus a review quiz

Key Benefits for Students

• Builds confidence converting between mixed numbers and improper fractions
• Shows more than one method so students can choose
• Reinforces simplifying answers
• Real-context problems make fractions meaningful

Why Teachers Love It

• No prep — ready for whole-class teaching on an interactive whiteboard
• Self-marking questions support independent practice
• Problem-solving tasks stretch confident learners
• Suits teaching, revision and homework
• A dependable follow-on to work on improper fractions

Love this? You’ll love…

• Add And Subtract Fractions: Same Denominators — Interactive Lesson (Year 7)
• Adding and Subtracting Fractions with Different Denominators — Interactive Lesson (Ages 11–14)
• Adding and Subtracting Fractions: Using a Calculator — Interactive Lesson (Ages 11–14)

A dependable addition to a KS3 fractions topic, giving students a clear route from basic conversions to confident calculations. Secure fraction arithmetic supports algebra, ratio and probability later on.

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FAQ

What year group is this for? KS3 — Years 7–9 (ages 11–14).

Which methods does it teach? Adding whole numbers and fractions separately, or converting to improper fractions first.

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