Identify knowns and unknowns in subtraction equations
I can identify knowns and unknowns in subtraction equations.
Identify knowns and unknowns in subtraction equations
I can identify knowns and unknowns in subtraction equations.
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Lesson details
Key learning points
- Equations can be represented using part-part-whole or bar models.
- If the minuend is missing, you add the subtrahend and difference.
- To find a missing part in a subtraction equation, subtract the other part from the whole.
Keywords
Minuend - The minuend is the number being subtracted from.
Subtrahend - A subtrahend is a number subtracted from another.
Difference - The difference is the result after subtracting one number from another.
Common misconception
Pupils may rely on the same strategies to solve all problems and may find it hard to remember when to add to find the missing part and when to subtract.
Emphasise the use of bar models, especially for pupils who are struggling. This will help them identify whether a part is missing or if the whole is missing, and whether they should add the parts or subtract a part from the whole to get the answer.
To help you plan your year 3 maths lesson on: Identify knowns and unknowns in subtraction equations, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 3 maths lesson on: Identify knowns and unknowns in subtraction equations, download all teaching resources for free and adapt to suit your pupils' needs.
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Explore more key stage 2 maths lessons from the Understand additive relationships and apply them to rearrange equations unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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Starter quiz
6 Questions
Exit quiz
6 Questions
36 − 10
66 − 20
84 − 20
44 − 10