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.
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.
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.
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.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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