Subtract a pair of 2-digit numbers by finding the difference
I can subtract a pair of 2-digit numbers by finding the difference.
Subtract a pair of 2-digit numbers by finding the difference
I can subtract a pair of 2-digit numbers by finding the difference.
Lesson details
Key learning points
- When the minuend and subtrahend are close in value, finding the difference can be an efficient strategy for subtraction
- Finding the difference means we count on from the subtrahend or count back from the minuend
- A number line or a bar model can represent finding the difference
Common misconception
Pupils will often try to use a written method/algorithm which they know gives an accurate answer but don't understand why it works.
Encourage the pupils to be brave and remind them that this is about mental subtraction so, with practice, will be quicker than any written methods.
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).
Video
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Starter quiz
6 Questions
Exit quiz
6 Questions
Minuend
Subtrahend
Difference
