Year 3 - Maths
Position 3-digit numbers on number lines
Representing 3-digit numbers, comparing and positioning on number lines
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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 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 position 3-digit numbers on number lines.
Key Notes
- Find the previous and next multiple of 10 or 100 to position numbers on a number line.
- The halfway steps can be used to help find the 5 or 50 numbers.
- Counting in steps of 1, 10 and 100 helps us to position a number on a number line.
Vocabulary To Learn
- Represent: Represent means showing something, or standing for something.
- 3-digit number: A 3-digit number represents a number of hundreds, tens and ones.
- Position: Position means where something is located.
Common Mistakes To Avoid
- Pupils may make errors using the halfway steps between numbers (e.g. wrongly label 374 as 379).
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Find the previous and next multiple of 10 or 100 to position numbers on a number line. The halfway steps can be used to help find the 5 or 50 numbers.
2. Use this key word in a maths sentence and explain it clearly. 'Represent'
Represent means showing something, or standing for something. 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 make errors using the halfway steps between numbers (e.g. wrongly label 374 as 379). Correction: Encourage pupils to find and label the halfway steps (e.g. the 5 or the 50s numbers).
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
- 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
- Use known facts to solve problems involving partitioning numbers 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.