Year 2 - Maths
Partition 2-digit numbers in different ways
Adding and subtracting ones and tens to and from 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 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 partition two-digit numbers in a range of ways.
Key Notes
- Two-digit numbers can be partitioned into two or more parts.
- Known facts can be used to help partition a two-digit number into a multiple of ten and another part.
- The patterns in the tens can help to predict new equations.
- Known facts can be used to help partition both the tens and the ones in a two-digit number.
Vocabulary To Learn
- Partition: To split a whole up into parts.
Common Mistakes To Avoid
- Children may think two-digit numbers can only be partitioned into tens and ones.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Two-digit numbers can be partitioned into two or more parts. Known facts can be used to help partition a two-digit number into a multiple of ten and another part.
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: Children may think two-digit numbers can only be partitioned into tens and ones. Correction: Use practical equipment to manipulate tens and ones on part-part-whole models to help children to understand the many ways that a number can be partitioned.
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
- 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
- Use number facts to solve problems in measures and data contexts Study Guide
Browse all guides in the Year 2 Maths guide library.