Year 5 - Maths
Calculate missing dimensions in rectangles and compound rectilinear shapes
Link area of rectangles to multiplication
Study Hub
Study Guides
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 calculate the area of a rectangle using multiplication and use their knowledge of area to solve problems.
Lesson Summary
You will learn to calculate missing dimensions in rectangles and compound rectilinear shapes.
Key Notes
- Division is used to calculate a missing dimension when the area and the other dimension are known.
- Inverse operations are used to calculate missing dimensions when areas are known.
- Compare different methods to decompose shapes and decide which is the most efficient.
Vocabulary To Learn
- Compound: A compound shape is made up of two or more shapes.
- Dimension: A dimension is a measurement of length in one direction. Width and height are examples of the dimensions of 2D shapes.
Common Mistakes To Avoid
- Applying known facts and strategies to solve problems involving division. Being able to break down a problem into steps when it comes to compound shapes.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Division is used to calculate a missing dimension when the area and the other dimension are known. Inverse operations are used to calculate missing dimensions when areas are known.
2. Use this key word in a maths sentence and explain it clearly. 'Compound'
A compound shape is made up of two or more shapes. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Applying known facts and strategies to solve problems involving division. Being able to break down a problem into steps when it comes to compound shapes. Correction: Provide opportunities to discuss approaches and highlight the efficient strategies and approaches. Acknowledge that there is more than one way to solve a problem whilst focusing on efficient and effective strategies.
More Lessons In This Unit
- Calculate the area of compound rectilinear shapes Study Guide
- Calculate the area of shapes made from 2 or more rectangles Study Guide
- Calculate the area of shapes made from 2 rectangles by decomposing the shape in different ways Study Guide
- Calculate the areas of rectangles using multiplication Study Guide
- Choose an efficient way to decompose a compound shape to calculate the area Study Guide
- Explain how to calculate the area of a rectangle using multiplication Study Guide
- Measure the area of flat shapes using square centimetres Study Guide
- Measure the area of flat shapes using square metres Study Guide
- Use knowledge of area to solve problems in a range of contexts Study Guide
Browse all guides in the Year 5 Maths guide library.