A 41-slide teaching presentation to use when exploring subtraction strategies.
Thisteaching presentation, which includes animations, has been designed to explain a variety of commonly usedmental computationstrategiesforsubtraction.
Before moving on to the written vertical algorithm for subtraction, lay a strong foundation and understanding of these mental computation strategies.
As there are a number of strategies covered in this presentation, it is assumed that the slides will be viewed over numerous lessons.
The following strategies are addressed:
- counting back
- counting on
- using known facts such asrainbow facts,doubles, subtracting 10
- making tens (partitioningto numbers that end in zero)
- usingfact familiesto think addition in order to subtract
- jump strategy
- split strategy
- regrouping (trading).
This PowerPoint includes hyperlinks to the following subtraction teaching resources:
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