Apply the distributive law to multiplication
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Why this why now
This unit explores the use of common factors in two-part problems to solve them efficiently. Pupils identify when there is a common factor and they can apply the distributive law and when there isn't. They also use the strategy to break down a factor in order to calculate products beyond their times table knowledge. This informal mental strategy will underpin more formal methods of multiplication in the future.
Prior knowledge requirements
- Recall multiplication facts to 12 _ 12
- Use arrays and grouping to model multiplication
- Partition numbers to simplify calculations
Threads
Why this why now
This unit explores the use of common factors in two-part problems to solve them efficiently. Pupils identify when there is a common factor and they can apply the distributive law and when there isn't. They also use the strategy to break down a factor in order to calculate products beyond their times table knowledge. This informal mental strategy will underpin more formal methods of multiplication in the future.
Prior knowledge requirements
- Recall multiplication facts to 12 _ 12
- Use arrays and grouping to model multiplication
- Partition numbers to simplify calculations
Apply the distributive law to multiplication
In this unit pupils will use knowledge of the distributive law to calculate products beyond known times tables facts and relate this to partitioning one of the factors.
5 lessons in unit
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