Explain and represent constant difference for subtraction
I can explain and represent constant difference for subtraction.
Explain and represent constant difference for subtraction
I can explain and represent constant difference for subtraction.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- If the minuend and subtrahend are both increased by the same amount, the difference stays the same.
- If the minuend and subtrahend are both decreased by the same amount, the difference stays the same.
- A number line can be used to represent the 'same difference' generalisation.
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.
Constant - A constant is a quantity that has a fixed value that does not change or vary, such as a number.
Common misconception
The concept of constant difference is difficult to understand when looking simply at abstract equations and numerals and pupils may find it challenging to 'see' the underlying structure of the maths.
Make good use of physical resources to reinforce the idea of constant difference. Number rods coupled with rulers or number lines can be very useful here. Take time with smaller values so pupils can generalise.
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).
Lesson video
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Starter quiz
6 Questions
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