Add and subtract mentally without bridging a boundary
Lesson 3 / 10
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Lesson outcome
I can add and subtract mentally without bridging a boundary with one or more digits changing
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Known facts to 10 can be applied when adding and subtracting 100s, 1,000s, 10,000s and 100,000s
When adding and subtracting mentally, the language of unitising supports us in addition to using known facts.
An understanding of the structure of numbers and place value supports when we add and subtract mentally.
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This content is by Cashar and published under an open licence.