Year 2 - Maths
Create addition and subtraction problems
Addition and subtraction of two 2-digit numbers
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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 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 create problems involving the addition and subtraction of two-digit numbers.
Key Notes
- When creating problems, we must decide whether we want to create an addition or a subtraction problem.
- Addition problems can involve combining two parts to make the whole.
- Addition problems can also involve increasing one part by the other part to reach the whole.
- Subtraction problems can involve partitioning one part from the whole to find the remaining part.
- Subtraction problems can also involve decreasing the whole by one part to find the remaining part.
Vocabulary To Learn
- Addition: Addition involves finding the total, or sum, by combining two or more numbers.
- Subtraction: Subtraction involves taking one number away from another.
- Bridge 10: An addition or subtraction strategy where numbers are partitioned to reach the previous or next multiple of 10, so bonds to 10 can be used to calculate more efficiently.
Common Mistakes To Avoid
- Children can have difficulty creating problems because they cannot process the amount of information needed and organise their thinking in the way necessary to know how to start.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
When creating problems, we must decide whether we want to create an addition or a subtraction problem. Addition problems can involve combining two parts to make the whole.
2. Use this key word in a maths sentence and explain it clearly. 'Addition'
Addition involves finding the total, or sum, by combining two or more numbers. 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 have difficulty creating problems because they cannot process the amount of information needed and organise their thinking in the way necessary to know how to start. Correction: Give criteria, such as the context, the numbers involved, an equation to represent, or a given structure of addition or subtraction to help focus and structure their thoughts.
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
- 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
- Solve problems involving the addition of two-digit numbers 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.