Year 4 - Maths
Use knowledge of the distributive law to solve problems in different contexts
Apply the distributive law to multiplication
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
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.
Lesson Summary
You will learn to use knowledge of the distributive law to solve problems in different contexts efficiently.
Key Notes
- The distributive law allows you to add or subtract known times tables to solve problems.
- You can partition the group number or the size of a group to solve problems.
- Factors can be re-combined or subtracted to simplify 2-part problems.
Vocabulary To Learn
- Distributive law: The distributive law says that multiplying a number by a group of numbers added together is the same as doing each multiplication separately.
- Polygon: A polygon is a 2D shape made up of 3 or more straight lines.
Common Mistakes To Avoid
- Pupils may be less familiar with the names and properties of polygons and this may be a distraction from the focus of the learning.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The distributive law allows you to add or subtract known times tables to solve problems. You can partition the group number or the size of a group to solve problems.
2. Use this key word in a maths sentence and explain it clearly. 'Distributive law'
The distributive law says that multiplying a number by a group of numbers added together is the same as doing each multiplication separately. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may be less familiar with the names and properties of polygons and this may be a distraction from the focus of the learning. Correction: Consider providing scaffolds for some pupils or pre-learning to revise shape names and properties.
More Lessons In This Unit
- Use knowledge of the distributive law to calculate products beyond known times tables Study Guide
- Use knowledge of the distributive law to calculate products using known times tables Study Guide
- Use knowledge of the distributive law to solve further two-part problems Study Guide
- Use knowledge of the distributive law to solve two part problems Study Guide
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