Year 1 - Maths
Ordinal numbers show the position of an object in relation to another
Composition of numbers 0 to 5
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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 revisit how numbers are represented cardinally and ordinally. They will partition 1 - 5 in different ways, find a missing part when one part and the whole are known and explore one more and one less with numbers to five.
Lesson Summary
You will learn to recognise, name and represent ordinal numbers and explain the difference between ordinal and cardinal numbers.
Key Notes
- Ordinal numbers indicate a single item or event rather than a quantity.
- Review how ordinal numbers are named and represented and show the shortened written names.
- Ordinal numbers contain part or all of the corresponding number words. First and second are exceptions.
- The difference between cardinal and ordinal numbers is the difference between quantity and position.
Vocabulary To Learn
- Ordinal number: A number that tells the position of something in relation to something else.
- Cardinal number: A number that shows how many of something there are.
- First to fifth: Ordinal numbers that describe the position of something.
Common Mistakes To Avoid
- Children may confuse ordinal and cardinal numbers.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Ordinal numbers indicate a single item or event rather than a quantity. Review how ordinal numbers are named and represented and show the shortened written names.
2. Use this key word in a maths sentence and explain it clearly. 'Ordinal number'
A number that tells the position of something in relation to something else. 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 confuse ordinal and cardinal numbers. Correction: Place an emphasis on these numbers in speech throughout the day. Continue to highlight the links between them.
More Lessons In This Unit
- Explain that numbers can represent how many objects there are in a set Study Guide
- Find a missing part when one part and the whole is known Study Guide
- Partition numbers one to five in different ways Study Guide
- Partition the numbers one to five in a systematic way Study Guide
- Show one more and one less than a number using representations Study Guide
- Show one more and one less than a number using representations and describe this accurately Study Guide
- Solve problems finding a missing part when one part and the whole is known Study Guide
- Solve problems using a bar model to represent a whole partitioned into two parts Study Guide
- Use a bar model to represent a whole partitioned into two parts Study Guide
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