Year 2 - Maths
Solve problems involving the addition of two-digit numbers
Addition and subtraction of two 2-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 apply their knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers both within and across the tens boundary.
Lesson Summary
You will learn to solve problems involving addition of two-digit numbers.
Key Notes
- Partitioning the addends can help us to solve problems involving two-digit numbers.
- Once we have written the equation, we must think carefully about the most efficient strategy to use.
- It is important to be able to calculate mentally before adding two 2-digit numbers.
Vocabulary To Learn
- Partition: To split a whole up into parts.
- Efficient: Not wasting time or effort. An efficient strategy is one we can carry out easily.
Common Mistakes To Avoid
- When the amount of processing required for a task increases, children often default to inefficient strategies such as counting in ones if the use of efficient strategies are not yet automatic.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Partitioning the addends can help us to solve problems involving two-digit numbers. Once we have written the equation, we must think carefully about the most efficient strategy to use.
2. Use this key word in a maths sentence and explain it clearly. 'Partition'
To split a whole up into parts. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: When the amount of processing required for a task increases, children often default to inefficient strategies such as counting in ones if the use of efficient strategies are not yet automatic. Correction: When solving problems, continue to focus upon, and discuss, the most efficient strategies to use to ensure that this thinking becomes automatic.
More Lessons In This Unit
- Add 2-digit numbers when crossing the tens boundary Study Guide
- Add two-digit numbers without crossing the tens boundary Study Guide
- Combine tens and ones within equations Study Guide
- Create addition and subtraction problems Study Guide
- Explain different strategies used to subtract Study Guide
- Find the missing addend when adding two-digit numbers Study Guide
- Find the missing part when subtracting two-digit numbers Study Guide
- Solve equations involving the subtraction of two-digit numbers Study Guide
- Solve problems involving addition and subtraction Study Guide
- Solve problems involving subtraction of two-digit numbers Study Guide
- Solve problems involving subtraction when bridging 10 Study Guide
- Subtract two-digit numbers crossing the tens boundary Study Guide
- Use efficient addition strategies to calculate Study Guide
- Use efficient methods to solve subtraction equations Study Guide
Browse all guides in the Year 2 Maths guide library.