Year 3 - Maths
Use addition and subtraction to solve problems involving bar charts, pictograms and tables
Informal and mental strategies for adding and subtracting two 3-digit numbers
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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 add and subtract two 3-digit numbers using partitioning, adjusting, redistribution and bridging.
Lesson Summary
You will learn to use addition and subtraction to solve problems involving bar charts, pictograms and tables.
Key Notes
- By looking carefully at the numbers involved, you can choose the most efficient strategy.
- When numbers are close together, finding the difference is the most efficient strategy.
- Sometimes, we can use known addition facts to make finding the difference even more efficient.
Vocabulary To Learn
- Bar chart: A bar chart uses rectangular bars to show different values.
- Pictogram: A pictogram is a graph that uses pictures to represent information.
- Table: A table has information arranged in rows and columns.
Common Mistakes To Avoid
- Children can often be overwhelmed by the amount of visual data they are presented with.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
By looking carefully at the numbers involved, you can choose the most efficient strategy. When numbers are close together, finding the difference is the most efficient strategy.
2. Use this key word in a maths sentence and explain it clearly. 'Bar chart'
A bar chart uses rectangular bars to show different values. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children can often be overwhelmed by the amount of visual data they are presented with. Correction: Expose children to graphical data as much as possible outside of maths lessons. Encourage children to make simple bar charts with cubes so they understand their formation and liken the searching for specific values to search and find books.
More Lessons In This Unit
- Add 2 and 3-digit numbers by redistributing Study Guide
- Add two 3-digit numbers using adjusting strategies Study Guide
- Add two 3-digit numbers using partitioning Study Guide
- Choose the most efficient strategy to add two 3-digit numbers Study Guide
- Choose the most efficient strategy to subtract from a 3-digit number Study Guide
- Subtract 2 or 3-digit numbers using partitioning and bridging a multiple of 10 Study Guide
- Subtract 3-digit multiples of 10 by finding the difference between them Study Guide
- Subtract a pair of 2-digit numbers by finding the difference Study Guide
- Use addition and subtraction to solve problems in different contexts Study Guide
Browse all guides in the Year 3 Maths guide library.