Year 2 - Maths
Use number facts to solve problems in measures and data contexts
Adding and subtracting ones and tens to and from 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 will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.
Lesson Summary
You will learn to use number facts to solve problems in measures and data contexts.
Key Notes
- Known addition and subtraction facts can be used to to help solve problems more efficiently.
- Drawing a bar model can help with understanding the problem.
Vocabulary To Learn
- Difference: The result of subtracting one number from another. How much one number differs from another.
- Whole: All of something. Complete.
- Part: A piece or a section of something.
Common Mistakes To Avoid
- Children may have difficulty understanding the different ways in which 'difference' can be represented and the language associated with this.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Known addition and subtraction facts can be used to to help solve problems more efficiently. Drawing a bar model can help with understanding the problem.
2. Use this key word in a maths sentence and explain it clearly. 'Difference'
The result of subtracting one number from another. How much one number differs from another. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children may have difficulty understanding the different ways in which 'difference' can be represented and the language associated with this. Correction: Use a bar model to highlight the structure of the difference and create a range of problems, using different language, that could be solved using the same equation, e.g. problems which use both how many more and how many less/fewer.
More Lessons In This Unit
- Add and subtract 1 to and from a 2-digit number crossing the tens boundary Study Guide
- Add and subtract 10 to and from a 2-digit number. Study Guide
- Add and subtract one to or from a two-digit number within a decade Study Guide
- Add by bridging a multiple of ten Study Guide
- Add multiples of 10 to 2-digit numbers. Study Guide
- Find 10 more or less than a 2-digit number. Study Guide
- Partition 2-digit numbers in different ways Study Guide
- Subtract by bridging a multiple of ten Study Guide
- Subtract multiples of ten from 2-digit numbers Study Guide
- Use bridging to solve addition and subtraction problems Study Guide
- Use efficient strategies to solve problems Study Guide
- Use number bonds to 10 to add/subtract one-digit and two-digit numbers Study Guide
- Use number facts to add or subtract a one-digit number and a two-digit number. Study Guide
- Use number facts to solve addition and subtraction problems. Study Guide
Browse all guides in the Year 2 Maths guide library.