Year 2 - Maths
Find the missing part when subtracting two-digit numbers
Addition and subtraction of two 2-digit numbers
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 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 missing number equations involving subtracting two-digit numbers.
Key Notes
- The parts and the whole can be rearranged to help us solve equations.
- A bar model or a part-part-whole model can be used to help understand missing number equations.
- Addition can be used to check subtraction equations.
- Addition can be used to solve missing number subtraction equations.
Vocabulary To Learn
- Part: A piece or section of a whole.
- Whole: All of something; complete.
Common Mistakes To Avoid
- When presented with missing number equations with larger numbers, children may not automatically make the link to the part-part-whole structure.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The parts and the whole can be rearranged to help us solve equations. A bar model or a part-part-whole model can be used to help understand missing number equations.
2. Use this key word in a maths sentence and explain it clearly. 'Part'
A piece or section of a whole. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: When presented with missing number equations with larger numbers, children may not automatically make the link to the part-part-whole structure. Correction: Use visual representations to consolidate understanding and to encourage children to manipulate the numbers or equations involved so they can utilise what they already know.
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
- 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.