Use knowledge of calculating within 20 to solve problems
Lesson 12 / 15
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I can use knowledge of calculating within 20 to solve problems in a range of contexts.
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When adding three addends, it is efficient to first add two addends using a known fact e.g. pair to 10 or double.
When adding, we can bridge 10 by partitioning a part so that we can ‘make 10’.
When subtracting, we can bridge 10 by partitioning a part to create a part that is equal to the ones digit of whole.
The difference can be found through subtraction.
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