Myths about teaching can hold you back
- Year 6
Add and subtract non-related fractions with different denominators
I can add and subtract non-related fractions with different denominators.
- Year 6
Add and subtract non-related fractions with different denominators
I can add and subtract non-related fractions with different denominators.
Lesson details
Key learning points
- Common denominators for non-related fractions can be found using common multiples of the denominators.
- Fractions need to have the same denominator if we are to add and subtract them.
- In equivalent fractions, the numerators and denominators have been scaled up or down by the same factor.
Keywords
Common denominator - When two or more fractions share the same denominator, you can say they have a common denominator.
Related fractions - Related fractions are when the denominator of one fraction is a multiple of the denominator of the other fraction.
Non-related fractions - Non-related fractions are when the denominator of one fraction is not a multiple of the denominator of the other fraction.
Common multiple - A multiple that is common between two or more numbers is known as a common multiple.
Common misconception
When adding or subtracting fractions with different denominators, you just add or subtract the denominators from each other.
Encourage the children to use prior generalisations such as when the numerators are the same, the fraction with the largest denominator is the smallest, to help them reason about the above misconception.
To help you plan your year 6 maths lesson on: Add and subtract non-related fractions with different denominators, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 6 maths lesson on: Add and subtract non-related fractions with different denominators, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 2 maths lessons from the Addition and subtraction of fractions unit, dive into the full primary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
Loading...
Prior knowledge starter quiz
6 Questions
Q1.Related fractions are fractions where:
Q2.What is the value of the numerator in the diagram?

Q3.Tick the pairs of related fractions.
Q4.What operation has taken place to scale the original fraction?

Q5.$$ {1} \over {3}$$ + $$ {3} \over {18}$$ = ___
Q6.$$ {4} \over {5}$$ + $$ {6} \over {20}$$ = ___
Assessment exit quiz
6 Questions
Q1.Non-related fractions are fractions in which:
Q2.Tick the correct symbol to compare these expressions.

Q3.Tick the correct symbol to compare these expressions.

Q4.Tick the multiple that could be used as a common denominator for $$ {1} \over {5}$$ and $$ {1} \over {6}$$
Q5.Tick the correct solution for $$ {3} \over {4}$$ + $$ {2} \over {7}$$ =
Q6.What number is missing from the equation?
