Solve subtraction calculations mentally by using known facts
I can solve subtraction calculations mentally by using known facts
- Year 6
Solve subtraction calculations mentally by using known facts
I can solve subtraction calculations mentally by using known facts
Lesson details
Key learning points
- Compensation can be used to simplify subtraction calculations.
- Equivalence can be used to simplify subtraction calculations.
- A number line can be used to represent compensation and equivalence.
Keywords
Minuend - The minuend is the number being subtracted from.
Subtrahend - A subtrahend is a number subtracted from another.
Partition - Partition is the act of splitting an object or value down into smaller parts.
Adjust - When you adjust you make a change to a number. This is done to make a calculation easier to solve mentally.
Common misconception
Known facts in this lesson include complements and two-digit subtractions which some children may find challenging to recall fluently.
It's a good idea, if possible, to do some pre-teaching here to develop the confidence of the children who might find the known facts aspect provides extra cognitive load. Supplying scaffolds such as key bonds to 20 and 100 may also benefit.
Licence
Lesson video
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