Year 3 - Maths
Use known facts to solve problems involving partitioning numbers
Representing 3-digit numbers, comparing and positioning on number lines
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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 use knowledge of place value to represent a 3-digit number in different ways. They will compare and order 3-digit numbers and position on number lines and unmarked number lines.
Lesson Summary
You will learn to use known facts to help you solve partitioning problems.
Key Notes
- Multiples of ten that total one hundred can help with adding and subtracting 3-digit numbers.
- Doubles and near doubles can be helpful when adding multiples of ten together.
- Partitioning 100 into 10 tens and combining tens to make 100 can help with calculating.
Vocabulary To Learn
- Double: Double means to become twice as many.
- Multiple: A multiple is the result of multiplying a number by another whole number.
Common Mistakes To Avoid
- Pupils may struggle when adding near double multiples of ten and when crossing 100s boundaries.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Multiples of ten that total one hundred can help with adding and subtracting 3-digit numbers. Doubles and near doubles can be helpful when adding multiples of ten together.
2. Use this key word in a maths sentence and explain it clearly. 'Double'
Double means to become twice as many. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may struggle when adding near double multiples of ten and when crossing 100s boundaries. Correction: Encourage pupils to use their known facts to support thinking and combine this with the use of base ten blocks, especially for crossing 100.
More Lessons In This Unit
- Add and subtract to and from a 3-digit number bridging 100 Study Guide
- Comparing and ordering numbers with 1, 2 and 3 digits Study Guide
- Count forwards and backwards in multiples of 2, 20, 5, 50 and 25 Study Guide
- Count forwards and backwards within 3-digits Study Guide
- Estimate the position of 3-digit numbers on unmarked number lines Study Guide
- Ordering sets of 3-digit numbers Study Guide
- Partition 3-digit numbers in different ways Study Guide
- Position 3-digit numbers on number lines Study Guide
- Represent a 3-digit number up to 1,000 in different ways Study Guide
- Solve problems by adding and subtracting to or from 3-digit numbers Study Guide
- Solve problems by counting forwards and backwards in multiples of 2, 20, 5, 50 and 25 Study Guide
- Use known facts to add and subtract multiples of 100 within 1000 Study Guide
- Use known facts to add and subtract to and from multiples of 100 Study Guide
- Write a 3-digit multiple of 10 as a multiplication equation Study Guide
Browse all guides in the Year 3 Maths guide library.